Well, I'm only 31 and haven't lived a lot of years yet, so answering only based on the years I've lived thus far, I'm going with 29. I really enjoyed being in my 20s, but the latter half of my 20s brought me a lot more wisdom than the first half. 29 because I would still be in my 20s but old enough to know more about who I am, what I'm capable of, and what I could really do with my life.