We know that Xavier somehow made himself look young, presumably through technology in the lab, but his reflection shows his real age. Could he have uploaded himself to a younger clone body or used some sort of fountain of youth technology to make himself appear young?I am being chased by someone trying to steal my youth.
Did any one search Marks body for items, if we presume for a moment that Xavier was possibly being partially honest about certain parts. What if Marks goal was actually to become young like Xavier by killing him for his youth?
I know in some time travel stories, incorrectly travelling through time alters the physical age of a person to look younger than they are. (e.g. Number 5 in Umbrella Academy, who is a 60 year old trapped as his younger 15 year old self.)