Ohio Population By Age Group and Age Cohort in 2021 (ACS-5Yrs)

Updated on February 28, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, among the 11.77M Ohio population, the 55-59yrs age group constituted the highest percentage of the total population (6.98%), followed by the 60-64yrs age group (6.79%), and the 25-29yrs age group (6.68%).

In the case of age cohorts, Adults (18-64yrs) constituted the highest percentage of the total population (60.62%), followed by Children (0-17yrs) (22.35%), and Seniors (65yrs and Over) (17.03%).

The first and second charts below shows the percentage of the population by age group and age cohort respectively. The table below also shows the number and percentages for each age group and age cohort.

You can see similar information for other states, and the United States.

Related Topics: Ohio ACS-5Yrs Estimates, 2021 Topic List.

Data Source: US Census - ACS 5-Year Estimates.

Ohio Percentages of Population By Age Group in 2021

55-59yrs

60-64yrs

25-29yrs

15-19yrs

10-14yrs

50-54yrs

30-34yrs

20-24yrs

35-39yrs

45-49yrs

Ohio Percentages of Population By Age Cohort in 2021

Adults (18-64yrs)

Children (0-17yrs)

Seniors (65yrs and Over)

Ohio Population By Age Group in 2021

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Age Group	Number of People	% of Total
55-59yrs	821573	6.98
60-64yrs	798875	6.79
25-29yrs	785985	6.68
15-19yrs	777556	6.61
10-14yrs	764371	6.49
50-54yrs	757500	6.44
30-34yrs	757273	6.43
20-24yrs	748606	6.36
35-39yrs	729681	6.20
45-49yrs	721388	6.13
5-9yrs	712811	6.06
40-44yrs	700376	5.95
Under 5yrs	689126	5.86
65-69yrs	676632	5.75
70-74yrs	520310	4.42
75-79yrs	338867	2.88
85yrs and Over	244470	2.08
80-84yrs	224523	1.91

Ohio Population By Age Cohort in 2021

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Age Cohort	Number of People	% of Total
Adults (18-64yrs)	7135132	60.62
Children (0-17yrs)	2629989	22.35
Seniors (65yrs and Over)	2004802	17.03