[whimsicalism]

> Could other 11 year olds spot a boy using mascara, a differing from one with thick eyelashes?

I think they would just default to making fun of him for wearing mascara. (source: i have thick eyelashes)

> Or tell that someone is shaving his legs when there isn't yet even peach fuzz on his chin?

definitely not.

> I couldn't, but I'm pretty oblivious to such things.

as am i, but i've learned that many other people are oddly skilled at picking up on these things.