People don't have to want to be with a person close to their own age, within legal and ethical parameters of course.
Just like when you see an actor or athlete with a long time partner/spouse who doesn't seem as physically attractive as other people you think the famous person could be with. You have no idea what that famous person wants out of their relationship, and to assume that physical attractiveness according to your standards is, or at least should be, the primary consideration when picking a partner is pretty shallow.