Sure, but those are not usually the decisive abilities. I would say that now, at 31, I may not be able to think as fast as when I was 20, but I also don't need

Sure, but those are not usually the decisive abilities. I would say that now, at 31, I may not be able to think as fast as when I was 20, but I also don't need to, because my thought processes converge on useful/correct solutions much faster. I may not be able to quickly analytically evaluate five different solutions like I used to, but I don't need to, because I know from wisdom/experience what the best solution is.