I'm 31 years old.
Well, not as of today specifically, in general. Depending on your perspective, I'm either young, old, or something in between. I side with something in between. It's been the running (based in fact) joke that I have / had issues with my age and being older, some of which have been more pressing as of late. So I'm going to talk on it a sec.
There are times when I feel like a 17 year old, and times like I feel like a 50 yeart old. But the actual circumstance of being older does not bother me. I realized when 30 happened that I was the same immature doof I was when I was 29. I am who I am, and age has very little to do with it. It's the ever shortening amount of time I have on this planet, however, that is the issue.
I like my life enough right now. It's lonely sometimes, and I would like some companionship (if it didn't cost me my soul). But I perpetually feel like that person who gets out of school; as if all the doors are open, and I can be whoever I want and do whatever I like with my life. And, to an extent, that is still true.
However, some doors close. And with everyone I know about 30 rushing to fill their lives with the things they want (marriage, houses, babies...) I don't feel the rush towards them. I always have a "there's plenty of time in life for those things" mentality, and I feel like those things would be great... someday. And today I say to myself that my life will be fine, even favorable in some cases, if I don't have those things.
But what happens when I'm 50, and I decide that I want those things and I don't have them. And then what if it's too late (for some of them)! It's that which worries me the most. And when this happens I say "Oh, whatever. I'm still so young. Don't stress over those things now."
But how long can I say that? When I've only got a 100 years to live.