Age is meaningless! Sure, there’s some areas where the skin may be less elastic than it used to and not as desirable for tattooing anymore as age progresses - but the wrist isn’t likely to be an issue yet. One of my friend’s mother in law got her first tattoo (Non medical-related) when she was in her mid-60s. Now she has at least 3 that I know of!
As to the pain, most of mine wasn’t painful at all, except the area right close to the bend of the wrist. That got my attention. The post-tattoo healing where it feels like a sunburn/road rash for a few days is more irritating, to me, than the actual tattoo process itself.