I am guessing that at age "almost 50" you are in better shape that many college age kids or mid-20 somethings. Seriously, has anyone really looked that people in this age group lately? Maybe the ones on the left coast are in better shape than their northeastern counterparts, but so many of them are overweight, and breath hard when going up stairs.
And does anyone have any guesses as to why so many college age people smoke?
To use an internet expression "WTF?"

I suspect there will be an increased demand for cardiologists before too long.

Dominae, I am 54. I ride a fixie. Brakes on both wheels. No cycle computer. Welcome to being a rebel.