[nonameiguess]

Realistically, at 36, you're too old to start in pro sports and no military is going to take you unless it's extremely desperate times or you're an MD. That's about it as far as being strictly limited. I didn't start in software until I was 34 and it didn't present any barriers I could see. Chances are you have a much more demanding life and possibly other people depending on you compared to when you were 20, but on the other hand, I also wanted to party, travel, experiment with drugs, date and have sex as much as possible, when I was 20, and had gotten that all out of my system by my mid-30s and I was ready to just hunker down and work.

Why do you even care what Sam Altman and Paul Graham think? What's your goal here? There's a world of difference in how much you need to impress someone to have a stable, rewarding career earning four times the median salary of any other industry that isn't finance or pro entertainment performer compared to trying to convince a VC firm they should give you 9 figures so you can hire a few hundred other people and expand your own business globally.