Will I live to be 80 ?

I recently picked a new primary care physician. After two visits and exhaustive lab test, he said I was doing "fairly well" for my age.

A little concerned about that comment, I couldn't resist asking him, "Do you think I'll live to be 80?"

He asked, "well, do you smoke tobacco or drink beer or wine?"

"Oh no", I replied. "I've never done either."

Then he asked, "Do you eat rib-eye steaks and barbecued ribs?" I said, "No, I heard that all red meat is very unhealthy."

"Do you spend a lot of time in the sun, like playing golf / sailing / ballooning / motorcycling / rock climbing?"

"No I don't", I said.

He said, "Do you gamble, drive fast cars, or sexually fool around?"

"No", I said. "I have never done any of those things."

He looked at me and said, "Then why do you give a shit if you live to be 80?"