So a man goes to see his doctor...

A man goes to see his doctor, and says, "Doc, I want to live to be 100 years old. I'd like you to tell me what my chances are."
The doc says, "Alrighty. Let's start with some basic questions. Do you drink?"
"No," the man says, "never touched a drop in my life."
"Well," says the doctor, "do you smoke?"
"I've never had so much as a puff of anything, ever!" replies the man.
"Do you ever mess about with women?" the doc enquires.
"No, sir, I like to live clean!" says the man.
The doctor looks at him, puzzled, and says, "Then why the HELL would you want to live to be 100?!"