vision changes throughout life, but for the most part people's vision pretty much stabilizes when they are in their early 20s, and stays that way until their 50s, at that point it's a different problem though, unlike in your younger years when your eyes are changing, the problem when you get older is that your eyes don't change as much making re-focusing more difficult. End result is that instead of needing one prescription, you end up needing two (bi-focals). I had my Lasik done at about age 25, and at age 35 my vision is still 20/15 (same as it was the week after the surgery) Eventually I'll probably need reading glasses, but there's a good chance I'll avoid needing bi-focals.
As for dry eye... I do wish someone had mentioned that before the surgery, I never saw anything at all about that in all the research I did (and I did quite a bit) but I will say that post-surgery my eyes are much drier than they were before the surgery. I won't really say it's an issue, I just wish I had known ahead of time. (that said, I would still have done it again in a heartbeat, best decision I ever made!)