Seminole County, FL population age distribution
A complete breakdown of Seminole 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 | 24,097 | 5.16% |
5 to 9 years | 28,044 | 6% |
10 to 14 years | 28,440 | 6.08% |
15 to 19 years | 28,051 | 6% |
20 to 24 years | 28,005 | 5.99% |
25 to 29 years | 33,346 | 7.13% |
30 to 34 years | 33,727 | 7.22% |
35 to 39 years | 33,683 | 7.21% |
40 to 44 years | 32,288 | 6.91% |
45 to 49 years | 32,040 | 6.86% |
50 to 54 years | 31,885 | 6.82% |
55 to 59 years | 30,497 | 6.53% |
60 to 64 years | 30,452 | 6.52% |
65 to 69 years | 24,032 | 5.14% |
70 to 74 years | 19,742 | 4.22% |
75 to 79 years | 12,292 | 2.63% |
80 to 84 years | 7,750 | 1.66% |
85 years and over | 9,011 | 1.93% |
TABLE OF CONTENTS
Seminole County, FL population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

The largest age group in Seminole County, FL was for the group of age 30-34 years with a population of 33,727 (7.22%), according to the 2021 American Community Survey.
At the same time, the smallest age group in Seminole County, FL was the 80-84 years with a population of 7,750 (1.66%).
Seminole County, FL population by age cohort
To better understand the age distribution of Seminole 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 | 98,668 | 21.11% |
18 to 64 years | 295,887 | 63.31% |
85 years and over | 72,827 | 15.58% |
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Seminole County's population under 18 was 21.11%, compared to the 22.51% nationwide.
- Seminole County's working population (between 18 and 64) was 63.31%, compared to 61.45% nationwide.
- Seminole County's elderly or the senior population (over 65 age) was 15.58% as compared to 16.04% nationwide.
Seminole County, FL population pyramid
Population pyramid for Seminole 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 Seminole County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Seminole County, FL, is 25.7.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Seminole County, FL, is 23.2.
- Total dependency ratio for Seminole County, FL is 48.9.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Seminole County, FL is 4.3.

Here's the Seminole County, FL's male and female population across different age groups:
Age Group | Population(Male) | Population(Female) | Total Population |
---|---|---|---|
Under 5 years | 12,362 | 11,735 | 24,097 |
5 to 9 years | 14,140 | 13,904 | 28,044 |
10 to 14 years | 14,550 | 13,890 | 28,440 |
15 to 19 years | 14,224 | 13,827 | 28,051 |
20 to 24 years | 14,061 | 13,944 | 28,005 |
25 to 29 years | 16,749 | 16,597 | 33,346 |
30 to 34 years | 16,889 | 16,838 | 33,727 |
35 to 39 years | 17,330 | 16,353 | 33,683 |
40 to 44 years | 15,126 | 17,162 | 32,288 |
45 to 49 years | 15,519 | 16,521 | 32,040 |
50 to 54 years | 15,412 | 16,473 | 31,885 |
55 to 59 years | 14,197 | 16,300 | 30,497 |
60 to 64 years | 14,959 | 15,493 | 30,452 |
65 to 69 years | 10,945 | 13,087 | 24,032 |
70 to 74 years | 8,983 | 10,759 | 19,742 |
75 to 79 years | 5,707 | 6,585 | 12,292 |
80 to 84 years | 2,879 | 4,871 | 7,750 |
85 years and over | 3,210 | 5,801 | 9,011 |
Things to know
What is the population of Seminole County, FL under 18?
Seminole County's population under the age of 18 is 98,668, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.11% of the total resident population of Seminole County, FL.
What is the aging population in Seminole County, FL?
Seminole County's population aged 65 years and above was 72,827. As per the U.S. Census Bureau's American Community Survey, this population is 15.58% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates