system
Given the following post, respond as if you're commenting on Reddit:
human
[X-Men] what's with Logan's aging?

Logan is hundreds of years old, and when he joins forces with Xavier near the turn of the 21st century, he appears to be in his early 30s, as he has for the vast majority of his life.

Fast-forward to (what I believe to be) ~17 years later. I can say this based on the aging of Xavier, whose mutation has nothing to do with longevity, apparently aging this much.  And what's this?  Logan also appears to be that much older.  What happened?  He still seems to be able to quickly regenerate from injury.  Even if it's not a quickly as he used to, I'd imagine it'd at least *slow* the effects of aging, rather than going from the perpetual trigenarian to a normally aging person.

What am I missing?
gpt
One theory is that he isn't aging slowly, but rather healing from aging as well as other injuries.

Every time Logan got shot, or stabbed, or whatever, he would essentially heal to a point where he was metabolically younger than before he was injured.

When Logan retired and stopped getting seriously injured all the time, his healing factor wasn't kicking in, and his aging progressed at a relatively normal rate.