I got this joke from my friend Wally G:

This is something to think seriously about.    Will I Live to see 80?
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 60.)
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, indulge in chocolate or coffee?’
‘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?’ He asked.
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?