I think the guy was saying 'similar powers to Superman' just for reference, not exactly the same. You live a normal life, age like a human.
Honestly, I'm leaning towards giving up 30 IQ points. I've tested as high as 160 before, and there's a lot of times I feel like I'm too smart to get along with people. I secretly judge them for doing things whose outcome are obvious to me, but I come across like a know it all if I try to warn them. But, I'm not driven enough to put that intelligence towards being a scientist or some other occupation you generally think of when you think of 'geniuses'. So, it's mostly just a hindrance. I see things others don't see, but they often dislike me for making them feel 'dumb', and I don't mean to do so.
But, maybe if I had Superman powers, then it wouldn't matter anymore! So, fuck my memories before 18. Most of the important memories are after that point.