I don't think I misinterpreted, "do things you can't do when you are in your 30s". That's a categorical statement and wrong. Yes, a 30something (40, 50, ...) is not a 20something, some plus, some minus, but nothing zero simply due to age.

I also don't think "make mistakes" and "try new things" are equivalent. Especially in the context of the lovely set of 'mistakes' advised in quite a few other posts in the thread.

Based on your followup, what you meant, is, unfortunately, not what you actually wrote. Nuance is important.