Will I Live to Be 80?

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 give a shit if you live to be 80?"