Delaware 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 981.89K Delaware population, the 55-59yrs age group constituted the highest percentage of the total population (7.10%), followed by the 60-64yrs age group (7.09%), and the 65-69yrs age group (6.57%).

In the case of age cohorts, Adults (18-64yrs) constituted the highest percentage of the total population (59.87%), followed by Children (0-17yrs) (21.15%), and Seniors (65yrs and Over) (18.98%).

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: Delaware ACS-5Yrs Estimates, 2021 Topic List.

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

Delaware Percentages of Population By Age Group in 2021

55-59yrs

60-64yrs

65-69yrs

25-29yrs

50-54yrs

30-34yrs

15-19yrs

10-14yrs

35-39yrs

20-24yrs

Delaware Percentages of Population By Age Cohort in 2021

Adults (18-64yrs)

Children (0-17yrs)

Seniors (65yrs and Over)

Delaware Population By Age Group in 2021

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Age Group	Number of People	% of Total
55-59yrs	69719	7.10
60-64yrs	69638	7.09
65-69yrs	64491	6.57
25-29yrs	64150	6.53
50-54yrs	63792	6.50
30-34yrs	63728	6.49
15-19yrs	61884	6.30
10-14yrs	60792	6.19
35-39yrs	59429	6.05
20-24yrs	57883	5.90
45-49yrs	57443	5.85
5-9yrs	56481	5.75
40-44yrs	56344	5.74
Under 5yrs	54234	5.52
70-74yrs	49465	5.04
75-79yrs	33567	3.42
80-84yrs	20141	2.05
85yrs and Over	18711	1.91

Delaware Population By Age Cohort in 2021

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Age Cohort	Number of People	% of Total
Adults (18-64yrs)	587872	59.87
Children (0-17yrs)	207645	21.15
Seniors (65yrs and Over)	186375	18.98