are they? doesn’t the 327M total pop include children? for the 74M kid count I used:
https://www.childstats.gov/americaschildren/tables/pop1.asp
see #35 for the employment numbers I used
74 million under 18 years old is correct.
People 65+ are 15.6%.
327 X 0.156 = 51 million
You said 132 million.