31-35 here.
Age is one of those things that I rarely pay attention to. I'm very bad at guessing it, for one, and I almost never get guessed correctly either -- some folks still think I'm in my early 20s.
It's also one of most stupid things to get upset over since it is one of those rare few things that we cannot change -- we can fight it, hide it or act like it means something but the end result is the same -- you're still getting older. we also can't make up our mind about it: we fetishize youth, acting as if looking eternally young was something to be cherished, but then chastize someone for 'acting childish'.
I don't have a problem being 34 right now; statistically speaking, I'm still less than half-way to my expected lifespan and yet people act as if you're "adult" when in your 20s and should be "mature" in your 30s. The way I look at it, I've lived nearly 20 years under someone else's dictate and have had barely 10-15 years so far to be allowed to explore myself truly as I see fit.
I wouldn't expect myself to 'settle down' until I'm 50-60, and even then I don't know what that means.