I'm 41 now but I did a lot of new stuff in my thirties. Had kids, started powerlifting, changed careers, moved to Japan again. When I look back I did a ton of stuff in my thirties. And I will in my forties too.
My 30's were a lot better than my 20's, that's fo sure. I moved to Cali - that was the best thing I ever did. Found a good relationship, and now starting my own business. So yea, my life's finally getting on track.
I think if I had it to do over, I would've been more active in my 20's.... maybe some sailing, bungee-jumping, more skiing, boating, rafting, rollerblading. And I would definitely get some hot-body pics done before I hit 30 hahaha!
Its interesting, I never thought that much about how much of a milestone it was when I turned thirty or the fact that my twenties were over.
I cant think of anything that major which I would say you absolutely have to do before you turn thirty, although I suppose that from I as in my mid to late twenties I have really begun to stop things which you would have done in an earlier more experimental phase of life, like drinking too much alcohol or trying different drinks of varying strengths all in the one night with awful consequences the next day.