Late to the party, as always.... I'm 38 and honestly I've never felt better. I had a grand time in my twenties, but I think I'm a happier person now than I've ever been. Plus, of course, I don't feel my age. Or any age, really. I just feel like me. I still look forward to everything I can do, I have a great guy and a home full of cats and makeup and clothes and shoes. I have great friends- this is probably one area where I would say my life has improved since my 20s- the bonds of friendship and who I'm really close to. I also think that my thirties have taught me a lot of discipline and focus that I didn't have when I was younger.
And anything that's declining in my 30s can be fixed with concealer.