Colorado Population by Age

The median age in Colorado is 37.1, as per 2021 ACS 5-Year Estimates. Of the total population, 18.21% were under the age of 15, 20.73% aged 15 to 29, 46.75% aged 30 to 64, 12.77% aged 65 to 84, and 1.54% were 85 years of age and older.
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Updated Sep 17, 2023

Colorado population age distribution

A complete breakdown of Colorado's age demographics from 0 to 85 years, distributed across 18 age groups is listed in the table below.

Age Group Population % of Total Population
Under 5 years 324,246 5.67%
5 to 9 years 347,653 6.07%
10 to 14 years 370,266 6.47%
15 to 19 years 369,984 6.46%
20 to 24 years 373,987 6.53%
25 to 29 years 442,444 7.73%
30 to 34 years 447,489 7.82%
35 to 39 years 421,236 7.36%
40 to 44 years 384,013 6.71%
45 to 49 years 364,101 6.36%
50 to 54 years 348,095 6.08%
55 to 59 years 365,606 6.39%
60 to 64 years 344,802 6.02%
65 to 69 years 293,687 5.13%
70 to 74 years 224,681 3.93%
75 to 79 years 129,810 2.27%
80 to 84 years 82,812 1.45%
85 years and over 88,264 1.54%
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Colorado population by age group

Key stats
1,786,136
Population under 25 years
1,695,182
Population aged 25-44
1,422,604
Population aged 45-64
819,254
Population aged 65+

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

The graph shows Colorado's population by age group, with age group on x-axis and the respective age group's percent of the total population on y-axis
Colorado population by age group. The largest age group was 30-34 years with a poulation of 447,489 (7.82% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Colorado was for the group of age 30-34 years with a population of 447,489 (7.82%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Colorado was the 80-84 years with a population of 82,812 (1.45%).

Colorado population by age cohort

To better understand the age distribution of Colorado's population, we divided it into the following 3 cohorts:

  • Children : Under the age of 18 years
  • Adults (working population): Between the age of 18 and 64 years
  • Seniors: 65 years and above
The pie chart shows Colorado's population divided into segments, with each segment representing an age cohort. The area of each segment is in the same proportion of a circle as the population of the cohort is of the total population.
Colorado population by age cohorts (Children: Under 18 years; Working population: 18-64 years; Senior population: 65 years or more). The largest age group was 18 - 64 years with a poulation of 3,641,187 (63.62% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the population for each of the three cohorts.

Age Group Population % of Total Population
Under 18 years 1,262,735 22.06%
18 to 64 years 3,641,187 63.62%
85 years and over 819,254 14.31%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Colorado's population under 18 was 22.06%, compared to the 22.51% nationwide.
  • Colorado's working population (between 18 and 64) was 63.62%, compared to 61.45% nationwide.
  • Colorado's elderly or the senior population (over 65 age) was 14.31% as compared to 16.04% nationwide.

Colorado population pyramid

Population pyramid for Colorado is charted below using the estimates from U.S. Census Bureau's American Community Survey 5-Year estimates. A wide base suggests population increase, narrow base indicates declining birth rates.

Key stats from our analysis of the Colorado's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Colorado, is 27.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Colorado, is 21.2.
  • Total dependency ratio for Colorado is 48.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Colorado is 4.7.
The graph shows Colorado's population across different age group and gender, with population on x-axis and population y-axis. The male population is plotted on the left in blue color whereas the female population is plotted on the right in pink color.
Colorado population pyramid i.e. Colorado population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Colorado's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 165,967 158,279 324,246
5 to 9 years 176,827 170,826 347,653
10 to 14 years 191,554 178,712 370,266
15 to 19 years 191,421 178,563 369,984
20 to 24 years 194,651 179,336 373,987
25 to 29 years 229,868 212,576 442,444
30 to 34 years 234,150 213,339 447,489
35 to 39 years 217,343 203,893 421,236
40 to 44 years 199,930 184,083 384,013
45 to 49 years 187,740 176,361 364,101
50 to 54 years 176,751 171,344 348,095
55 to 59 years 181,659 183,947 365,606
60 to 64 years 168,811 175,991 344,802
65 to 69 years 141,713 151,974 293,687
70 to 74 years 107,867 116,814 224,681
75 to 79 years 60,174 69,636 129,810
80 to 84 years 35,468 47,344 82,812
85 years and over 34,042 54,222 88,264
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Things to know

What is the population of Colorado under 18?

Colorado's population under the age of 18 is 1,262,735, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 22.06% of the total resident population of Colorado.

What is the aging population in Colorado?

Colorado's population aged 65 years and above was 819,254. As per the U.S. Census Bureau's American Community Survey, this population is 14.31% of the entire population.

References

Datasets

Explore datasets by year of publication.
2023
Colorado Age Group Population Dataset: A complete breakdown of Colorado age demographics from 0 to 85 years, distributed across 18 age groups
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the Colorado population distribution across 18 age groups. It lists the population in each age group along with the percentage population relative of the total population for Colorado. The dataset can be utilized to understand the population distribution of Colorado by age. For example, using this dataset, we can identify the largest age group in Colorado.

Key observations

The largest age group in Colorado was for the group of age 30-34 years with a population of 447,489 (7.82%), according to the 2021 American Community Survey. At the same time, the smallest age group in Colorado was the 80-84 years with a population of 82,812 (1.45%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Colorado population by age group

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Age groups:

  • Under 5 years
  • 5 to 9 years
  • 10 to 14 years
  • 15 to 19 years
  • 20 to 24 years
  • 25 to 29 years
  • 30 to 34 years
  • 35 to 39 years
  • 40 to 44 years
  • 45 to 49 years
  • 50 to 54 years
  • 55 to 59 years
  • 60 to 64 years
  • 65 to 69 years
  • 70 to 74 years
  • 75 to 79 years
  • 80 to 84 years
  • 85 years and over

Variables / Data Columns

  • Age Group: This column displays the age group in consideration
  • Population: The population for the specific age group in the Colorado is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Colorado total population. Please note that the sum of all percentages may not equal one due to rounding of values.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Colorado Population by Age. You can refer the same here

Colorado Age Cohorts Dataset: Children, Working Adults, and Seniors in Colorado - Population and Percentage Analysis
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the Colorado population by age cohorts (Children: Under 18 years; Working population: 18-64 years; Senior population: 65 years or more). It lists the population in each age cohort group along with its percentage relative to the total population of Colorado. The dataset can be utilized to understand the population distribution across children, working population and senior population for dependency ratio, housing requirements, ageing, migration patterns etc.

Key observations

The largest age group was $b3_v1 with a poulation of $b3_v2 ($b3_v3 of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Colorado population by age cohort

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Age cohorts:

  • Under 18 years
  • 18 to 64 years
  • 65 years and over

Variables / Data Columns

  • Age Group: This column displays the age cohort for the Colorado population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Colorado is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Colorado is shown in the following column.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Colorado Population by Age. You can refer the same here

Colorado Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the Colorado population pyramid, which represents the Colorado population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey 5-Year estimates. It lists the male and female population for each age group, along with the total population for those age groups. Higher numbers at the bottom of the table suggest population growth, whereas higher numbers at the top indicate declining birth rates. Furthermore, the dataset can be utilized to understand the youth dependency ratio, old-age dependency ratio, total dependency ratio, and potential support ratio.

Key observations

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Colorado, is 27.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Colorado, is 21.2.
  • Total dependency ratio for Colorado is 48.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Colorado is 4.7.

Colorado population pyramid

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Age groups:

  • Under 5 years
  • 5 to 9 years
  • 10 to 14 years
  • 15 to 19 years
  • 20 to 24 years
  • 25 to 29 years
  • 30 to 34 years
  • 35 to 39 years
  • 40 to 44 years
  • 45 to 49 years
  • 50 to 54 years
  • 55 to 59 years
  • 60 to 64 years
  • 65 to 69 years
  • 70 to 74 years
  • 75 to 79 years
  • 80 to 84 years
  • 85 years and over

Variables / Data Columns

  • Age Group: This column displays the age group for the Colorado population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Colorado for the selected age group is shown in the following column.
  • Population (Female): The female population in the Colorado for the selected age group is shown in the following column.
  • Total Population: The total population of the Colorado for the selected age group is shown in the following column.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Colorado Population by Age. You can refer the same here

If you're looking for datasets from another year, please feel free to contact us at research@neilsberg.com and we'll be happy to assist you further.

About the author

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Neilsberg Research
Neilsberg Research team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.

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