That's also my philosophy.
I'm in my early 40's and was a heavy smoker and partyer until my early 30's, when I decided I wanted to still be fit and able at 60. I quit smoking, started drinking more reasonably, getting enough sleep, avoiding stress and overthinking stuff (Thailand helped me with that), eating and exercising reasonably and drinking plenty of water. I hardly ever take meds, not even a paracetamol.
Basically I'm increasing my chances of still being able to enjoy life in 20 years when I will be free of parental responsibilities. And if I get knocked down by a car tomorrow, well, « c'est la vie ».