Lost tribe of Westwood

I recently picked a new primary care doctor. 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, "Do you smoke tobacco, or drink beer or wine?" "Oh no,"I replied. "I'm not doing drugs, either!"
Then he asked, "Do you eat rib-eye steaks and barbecued ribs?" I said, "No, my former doctor said that all red meat is very unhealthy!"
"Do you spend a lot of time in the sun, like tennis, 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.
He looked at me and said, "Then, why do you even give a shit?"