Just good old Wear and tear. Not much you can do about that cuff, Keep it ply with a bit of mink oil or something on it, Personally I like a Ratty old Jacket more than a brand spankin new one...more character!
I wouldn't use mink oil - I find it rots stitching and only temporarily makes the leather looks better - dries out quickly. I'd use Pecards as used by the Smithsonian Institution on their leather or Lexol an easy spray on that vintage car clubs use to maintain leather upholstery.