Two old men were sitting on a park bench in Fairbanks, Alaska, enjoying the -45 degrees winter scenery. One says, “I bet I can tell you how old you are.”

The other says, “You’re crazy.”

“I guarantee you.”

“Okay, what do I have to do?”

“Take down your pants.”

“What?”

“You heard me. Take down your pants.”

The second man finally drops his pants. The first one studies the wrinkled rump for a moment and says, “You’re eight-six years old.”

“You’re a genius! How can you know my age by looking at my rear end?”

“Simple. You told me yesterday.”