NEWS YOU CAN USE (WELL, SOME OF YOU): 21 Things Fiftysomethings Wish Twentysomethings Knew. Some of these are BS, though. Honestly, I think it’s a bigger mistake to overthink having kids than the reverse; I thought the opposite in my 20s. And my body feels better than it did in my 20s, though that’s more a function of what kind of shape I was in in my 20s than of where I am now. . . .