I have a question concerning Wolverine's supposed aging as a result of The Wolverine film.
His file says that because his healing factor was drained a little, he started aging, but if his healing factor was restored to its entirety, would his aging slow to a crawl instead of aging to the point of having a few gray hairs?
Welcome to the wiki! Sorry for the late response. I regard to your question, the grey hairs that Wolverine had was due to him aging and was used because he had it in the comic it was based on. Wolverine does age, as seen with Old Man Logan, but it is at a much slower rate. His healing factor being drained may have had an impact, but he would still age over time.
But that doesn't explain what happened in DoFP. If he did change the outcome of what happened in the past, then shouldn't he have probably avoided what happened to him in The Wolverine? I mean, even if he does get gray hair in the future, it should be in the far future where everyone he knows in the present is gone, which shows that he's not an immortal, just long-lived.
The year that film is set in is 2023, ten years after The Wolverine is set. It is there because of the comic book it is based on. The comic Old Man Logan where Wolverine has aged and teams up with an old-aged Hawkeye, meaning that he has aged by the time they are older. Obviously that is a comic and Hawkeye isn't in the universe, but there are rumours of the new film being based on that comic. He still ages, it's just a lot slower. He has looked the same for many decades, I don't think it is hard to imagine him just having some grey hair an issue by this time. He is over 100 years old and he looked as if he was in middle age when he was fighting in wars.
Wolverine is not immortal, he can die. He has died in the comics. Whether or not he will die naturally is unknown as that has never happened in the comics. But it is possible to assume over a very long period of time.
However, the Wikipedia has explained that his healing factor has been shut down and he was covered in Adamantium and died when it hardened. I've not read any of the comics, but it disappoints me to know that the writers killed him off like that.
The day they bring him back in the comics will be the day I have greater respect for them.