Except for a terrible disappointment I've suffered in the past year that has really upended my life and caused me great pain, I think that in general getting older is much better than being younger. I am more comfortable in the world, because it has changed with me, so it makes much more sense now than when, as a newly hatched person, I was thrown into a world that preceded me and that I didn't understand (not that I understand everything now, but most of how things work now makes at least some sense to me).
I am more tolerant of other people's flaws and mistakes. I can take things in stride better. I am more accepting, both of other people and of the random things that can happen, because I know now that unexpected things can happen, and that it does no good to rail against them but it's better to accept that the world is as it is, unpredictable and sometimes sucky.
I am better at not passing judgment and recognizing that people are who they are, and that I'm not going to be changing them, and also that some things I don't like or think are wrong are actually fine, in that they exist, and I don't have to concern myself with judging them or shaking my fist at them. (I'm still angry, sad, frustrated, etc, but not as intensely and not as often.)
My health is worse. My ability to do things has diminished. But I'm also better at accepting those facts.
As far as looks, I've never been pretty, so I am not worried about losing my youthful looks, since I never had them.