When you transition from your 20s to 30s, there's something of a freak-out that can occur. I freaked around 27, then got over it. THANK GOODNESS. Once I hit 30, I determined, on a cellular level, that I would punch the daylights out of anyone judging my appearance and I felt calm. I recently went to a club and someone guessed my age as 21. Some lady in a grocery store asked if I was 23 or 24. I chalk this up to taking care of myself, encouraging good genetics, and refusing to act old.
Smack anyone who bitchs about getting old just so you can suffer with them. Yes, getting older is hard in many ways, but don't let anyone take you hostage.