A ninety-year-old man is sitting on a park bench, sobbing, when a
 young man walks by and asks him whats wrong.
 Through his tears the old man answers, "I'm in love with a
twenty-year-old woman."
 
 "What's wrong with that?"  the young man asks.
 
 Again, between his sobs, "You don't understand.  Every morning before
 she goes to work we make love, at lunchtime she comes home and we
 make love again, and then she makes my favourite meal.  In the
 afternoon when she gets a break, she rushes home and gives me oral
 sex, the best an old man could ever want.  And then after suppertime,
 and all night long, we make love."
 
 He breaks down, and is no longer able to speak.
 
 The young man puts his arm around him.  "I don't understand.  It
 sounds like you have the perfect relationship!   Why are you
 crying??"
 
 The old man again, answers between sobs...
 
 "I forgot where I live!!"