Young, old, middle aged, the muscles underlying the facial forms are the same. You gave your poor old man lumps and bumps where no healthy person would have them. I realize you said you were making a caricature, not super realistic, but that doesn’t give you the right to just make stuff up. I think you are going overboard with an “old=furrows, lumps and ridges” idea. Study your references.
He is much improved around the mouth and forehead. He still has this weird unnatural muscle running from his temple down to his jaw, and his zygomatic arch is unaccountably angling up over his ear, instead of heading for the center of the ear. Fix those two spots and you’ll have a pretty good base for adding fine wrinkles and other age barnacles, as my dermatologist calls them.