Two older gentlemen are sitting on a bench in the park. One is 90 years old and is in great shape; he just finished a jog and he isn't even out of breath. The other is 80 years old and isn't nearly as healthy.
The 80 year old asks, "If you could, can you tell me what is the secret to your excellent health? You seem to have the energy of a man half your age". The 90 year old answers, "I do have a secret... its rye bread. I eat rye bread every day. Not only does it give me energy, but it helps with the ladies, if you know what I mean".
"Better than Viagra?"
"Absolutely"
So the 80 year old thanks him and goes off in search of a bakery. He goes into the first one he finds. The young woman at the counter asks "May I help you sir?". "Yes, do you have any rye bread?" "Absolutely"
"OK, I'll take five loaves"
"Five loaves? You know it will get hard before you get to the second or third one"
The 80 year old responses annoyed "Does everyone know about this secret except me!?!"