Two old guys, one 90 and one 97, were sitting on a park bench one morning. The 97-year-old had just finished his morning jog and wasn't even short of breath. The 90-year-old was amazed at the guy's stamina and asked him what he did to have so much energy.
The 97-year-old said, "Well, I eat rye bread every day. It keeps your energy level high and you'll have great stamina with the ladies."
So, on the way home the 90-year-old stopped at the bakery. As he was looking around, the saleslady asked if he needed any help.
He said, "Do you have any rye bread?"
She said, "Yes, there's a whole shelf of it. Would you like some?"
He said, "I want five loaves."
She said, "My goodness, five loaves! By the time you get to the 3rd loaf, it'll be hard."
The old man says to himself, "I can't believe everybody knows about this but me."