Lol, thats asking for trouble.
But if you want the lowdown, why not ask a woman in that age bracket?
Your guaranteed to get a definitive, possibly emphatic answer
Not even 30.... by their late 20's the party's already over. I think it's genetic not environmental because you see some foreign-born women in their 30s in the US who still look decent.
OK, have you ever looked at aging East European women? They age much worse than Western women.
Again, you have to compare a few different ethnic, geographical, social groups to make such a claim.