Miami-Dade County, FL population age distribution
A complete breakdown of Miami-Dade County'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 | 152,983 | 5.69% |
5 to 9 years | 147,115 | 5.47% |
10 to 14 years | 156,543 | 5.82% |
15 to 19 years | 156,815 | 5.83% |
20 to 24 years | 159,492 | 5.93% |
25 to 29 years | 182,425 | 6.78% |
30 to 34 years | 191,625 | 7.12% |
35 to 39 years | 182,193 | 6.77% |
40 to 44 years | 188,388 | 7% |
45 to 49 years | 195,795 | 7.28% |
50 to 54 years | 197,336 | 7.34% |
55 to 59 years | 189,150 | 7.03% |
60 to 64 years | 155,068 | 5.76% |
65 to 69 years | 129,570 | 4.82% |
70 to 74 years | 108,344 | 4.03% |
75 to 79 years | 77,929 | 2.9% |
80 to 84 years | 56,914 | 2.12% |
85 years and over | 62,428 | 2.32% |
TABLE OF CONTENTS
Miami-Dade County, FL population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

The largest age group in Miami-Dade County, FL was for the group of age 50-54 years with a population of 197,336 (7.34%), according to the 2021 American Community Survey.
At the same time, the smallest age group in Miami-Dade County, FL was the 80-84 years with a population of 56,914 (2.12%).
Miami-Dade County, FL population by age cohort
To better understand the age distribution of Miami-Dade County, FL'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

Here's the population for each of the three cohorts.
Age Group | Population | % of Total Population |
---|---|---|
Under 18 years | 550,927 | 20.48% |
18 to 64 years | 1,704,001 | 63.34% |
85 years and over | 435,185 | 16.18% |
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Miami-Dade County's population under 18 was 20.48%, compared to the 22.51% nationwide.
- Miami-Dade County's working population (between 18 and 64) was 63.34%, compared to 61.45% nationwide.
- Miami-Dade County's elderly or the senior population (over 65 age) was 16.18% as compared to 16.04% nationwide.
Miami-Dade County, FL population pyramid
Population pyramid for Miami-Dade County, FL 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 Miami-Dade County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Miami-Dade County, FL, is 25.4.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Miami-Dade County, FL, is 24.2.
- Total dependency ratio for Miami-Dade County, FL is 49.6.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Miami-Dade County, FL is 4.1.

Here's the Miami-Dade County, FL's male and female population across different age groups:
Age Group | Population(Male) | Population(Female) | Total Population |
---|---|---|---|
Under 5 years | 78,226 | 74,757 | 152,983 |
5 to 9 years | 74,002 | 73,113 | 147,115 |
10 to 14 years | 80,720 | 75,823 | 156,543 |
15 to 19 years | 79,931 | 76,884 | 156,815 |
20 to 24 years | 80,850 | 78,642 | 159,492 |
25 to 29 years | 92,288 | 90,137 | 182,425 |
30 to 34 years | 98,261 | 93,364 | 191,625 |
35 to 39 years | 92,220 | 89,973 | 182,193 |
40 to 44 years | 94,785 | 93,603 | 188,388 |
45 to 49 years | 98,432 | 97,363 | 195,795 |
50 to 54 years | 98,862 | 98,474 | 197,336 |
55 to 59 years | 91,446 | 97,704 | 189,150 |
60 to 64 years | 73,151 | 81,917 | 155,068 |
65 to 69 years | 58,119 | 71,451 | 129,570 |
70 to 74 years | 47,962 | 60,382 | 108,344 |
75 to 79 years | 33,671 | 44,258 | 77,929 |
80 to 84 years | 21,187 | 35,727 | 56,914 |
85 years and over | 21,999 | 40,429 | 62,428 |
Things to know
What is the population of Miami-Dade County, FL under 18?
Miami-Dade County's population under the age of 18 is 550,927, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 20.48% of the total resident population of Miami-Dade County, FL.
What is the aging population in Miami-Dade County, FL?
Miami-Dade County's population aged 65 years and above was 435,185. As per the U.S. Census Bureau's American Community Survey, this population is 16.18% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates