IME, some of the small wrinkles of skin (if that's what you're talking about) can shrink with time, but it's a slow process. I saw some of that small-folds skin shrink even into year 2 of maintenance (age 60-62; I'm 65 now). Just sticking with a healthy eating routine, healthy cardio/strength exercise, avoiding the bad habits (too much unprotected sun, smoking excess alcohol), good hydration, are the the best things we can do to keep skin as healthy as feasible, I think.

Having lost a few pounds over the past year (slowly by intention), I now have another round of the thin-wrinkles stuff . . . we'll see if it continues to tighten up this time, or not, I guess. 😉

I have very crepey skin on my upper arms and legs. I am not overweight or never have lost a lot of weight so I am thinking it is just the aging process and hereditary. I'm 63. As long as I am healthy I just accept what it looks like.
PS....Someone (close family member) made a comment how my upper arms looked kinda flabby. I have been doing pull ups on a pull up bar for years. Do about 12 - 3x a day. So I challenged that person to do some pull ups with me. They could not EVEN come close to what I was able to do. So the muscle is there just have this crepey skin around it. It is what it is.

I call it chicken skin. Not pretty..but I don't think there's a solution.