web search -> data from the american community survey (done by the US census bureau)

But here’s a BLS page, https://www.bls.gov/cps/cpsaat11b.htm

Adding up a few related categories that’s only counting about 2 million workers, so it’s also possible that some younger workers aren’t being properly counted in the right category. Dunno...

Also keep in mind, a whole lot of programmers are working on some legacy enterprise applications instead of working at young companies on web apps. In some companies the age distribution is going to skew much younger.