Will I Live to see 80? ~~~~ something to think about

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. (I just turned 50.)

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, 'Not much... My former 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.        

He looked at me and said,... "Then, why do you even give a shit?"