Yes and no. I had my PRK done nine years ago at age 37. So long as your corneas are done growing/changing, you should be perfectly fine and your results should be essentially permanent.
So why did I say yes and no? Because there is still the potential issue of age-based need for reading glasses. As Dr Hoopes Jr explained to me, many people will need reading glasses in their later years due to weakened eye muscles that have trouble focusing up close. Because this is a muscle issue and not related to the shape of your corneas, Lasik/PRK does nothing to prevent this situation. This is why he cautioned me before my procedure: "while PRK/lasik will permanently alter the shape of your corneas, this is no guarantee you will never need reading glasses at some point years down the road." Nearly a decade later, I am still in the clear as far as reading goes.
I hope that doesn't scare you off. I continue to be 100% satisfied with my own results. My only regret is that I didn't do it years sooner.