I'm 43 - First time I did restylane was for my laugh lines, and the injections were tolerable until the doctor got lower where he hadn't put the block. Hurt like hell! Had minor swelling, and happy with the results, lasted almost 2 years.
Then I got it done again by another (very good) plastic surgeon and he gave me LOTS of block. And, I still felt the injections! (The block injections in my mouth weren't very fun either) But, the swelling was awful, I looked like Jay Leno for 2 weeks. But, I have to say, that was 2 1/2 years ago, and it is still holding.
I guess I'm a lucky one where it lasts a long time.
I want to try the hollow in my cheeks now, but I'm a bit hesitant because it seems like it gets more mixed reviews.