Having just been listening to the pair talk, the man had finished his burger and fries with machine-like precision, now casually sipping on his beverage while his meal settles.
"Time is relative to where you are, so depending on how long you're in an area, you can count that time to your age. For example, I age slower than others, so I don't look as old as I am. But, because of the time I have spent in some accelerated universes, I'm actually in my late sixties."
He takes a long pull on his drink, looking between the two, when his watch chirps. Literally. He glances down at it, then, still with the straw in his mouth, he nods to it and then the young man.