Run a few miles 2-3 times a week, 7-9 mile bike ride a couple times a week, full gym in my garage where I squat, squat, squat! Keeping that posterior chain alive and awake is crucial for riding. Also do a lot of hiking, yoga, core work.
I'll be 60 in January, and fitness along with a mostly whole-food/plant based diet has kept me doing the things that I want.
Also save the cigars and the scotch as a treat for long road trips only.