Harry Lloyd’s Charles looks to be the same age as Dan Stevens’ David in that quick look, but if Xavier ages like another actor who portrayed him, Patrick Stewart, this doesn’t mean much.
That’s a cool tease of Professor X, although it doesn’t do much beyond confirm he’ll have one physical scene in the final season.
We still don’t know if he’ll meet his son David, or if this is a scene that takes place in a flashback or the present day.