This "started coding in middle/high school or college" is a misleading metric since it assumes everyone has equal access and support to learn that way.
As some one from India who never had own computer until finishing college (the early 00's), along with no internet or cell phone, I find it hard to accept/respect those people who gloat about how early they started coding.
I always assume there are thousands of kids in the US who were/are not as lucky as the kids who started coding while they were in their diapers.
People/companies in US love to talk about their efforts to fix diversity, but without fixing this attitude of "earlier you learn, better you are" attitude, no amount of throwing money will fix it for the true diversity candidates.