One day there was an old man who was in his late eighties sitting 
 on a park bench crying.  One curious passer by sat down with the 
 distraught old man and asked him what the problem was.  The old man 
 replied, "I married a twenty year old woman.  All she wants is sex in the 
 morning, sex in the afternoon, sex all night long."  The man looks at the 
 old man and says, "I don't see why you are crying, I'd think you would be 
 the happiest man on earth."  The old man then says, "that's not the 
 problem.  I can't remember where I live."