City of Armstrong 2010 Census sorted by Age
Total	926	100.0%
Under 5 years	59	6.4%
5 to 9 years	47	5.1%
10 to 14 years	52	5.6%
15 to 19 years	49	5.3%
20 to 24 years	28	3.0%
25 to 29 years	58	6.3%
30 to 34 years	47	5.1%
35 to 39 years	36	3.9%
40 to 44 years	48	5.2%
45 to 49 years	52	5.6%
50 to 54 years	69	7.5%
55 to 59 years	83	9.0%
60 to 64 years	64	6.9%
65 to 69 years	59	6.4%
70 to 74 years	34	3.7%
75 to 79 years	40	4.3%
80 to 84 years	48	5.2%
85 years and over	53	5.7%

For more info, here is the site this data was taken from: Complete data broken down even further

More Fun population data from Iowa Demographics

ISU detailed data about Armstrong's population

Zip Code 50514 2010 Census by Age
Total	1,452	100.0%
Under 5 years	99	6.8%
5 to 9 years	71	4.9%
10 to 14 years	83	5.7%
15 to 19 years	72	5.0%
20 to 24 years	54	3.7%
25 to 29 years	77	5.3%
30 to 34 years	75	5.2%
35 to 39 years	59	4.1%
40 to 44 years	76	5.2%
45 to 49 years	99	6.8%
50 to 54 years	122	8.4%
55 to 59 years	96	6.6%
65 to 69 years	81	5.6%
70 to 74 years	64	4.4%
75 to 79 years	58	4.0%
80 to 84 years	60	4.1%
85 years and over	62	4.3%
Median age (years)	48.2	( X )

ZipCode.com site. More data for the curious.

Compare 2000 and 2010 at zip-codes.com