I don't know man, in my opinion there are more factors to it than just the man wanting a divorce and a younger wife.

What about kids? What age are the kids? If they have two young kids, I would say this is very wrong to divorce. For the sake of the kids they should try to work on their relationship.

Or what about the woman? If they are both unhappy in their relationship and don't want to work it anymore, then sure it's fine to divorce.