

Sexualization of children.
I hate to say it, but something is changing the physicality of age groups. At least I think that is what is happening. I swear there are teenagers today who look like adults in their 20s and young adults who don’t look over 18. I get scared seeing a conventionally attractive person (by stereotypical standards), wondering if I’m being a creep because I can’t identify their age group. Hell, I work among some people who easily can be mistaken for being under 18. Thankfully I know the company has a hiring minimum of 18.
EDIT: My point, that I should have stated, was if you surveyed a random sampling of a American suburban neighborhood, it might not be easy to identify age groups anymore.
I played education games on a Apple II in 1998; I was in the first grade.