I recently picked a new primary care physician.

 After two visits and exhaustive lab tests,

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/wine?"

"Oh no," I replied.  "I'm not doing either."
 

Then he asked, "Do you eat rib-eye steaks and barbecued ribs?"

I said, "No, my other Doctor said that all red meat is very unhealthy!"

 "Do you spend a lot of time in the sun, like playing  golf,

 sailing, hiking, or bicycling?"

No, I don't," I said.

 He asked, "Do you gamble, drive fast cars, or have a lot of sex?"

"No," I  said.  "I don't do any of those things."

 He looked at me and said,

"Then why do you care if you live to be 80?"