I'll give my personal perspective a try again. But making it quick.

I'm not about training for an event. Never was really. Too safety conscious to participate in big or medium events. Just not my cuppa.

I train (for lack of a better term)
to wake up feeling good everyday,
to keep my weight and other things in balance.
to not have Rx meds.
to maintain balance and leg strength
to sleep better at night.

35+ years as a continuous adult cyclist, less when the kids were babies, should have helped the longevity side of what genetics may dictate.

I practice = listen to your body and deep breathing meditation. and cross-train with hiking, gardening an acre and home projects. Should use the free weights for upper body.

Volunteer ski patroller and summer wilderness ranger are past joys.

Max heart rate = who cares.

So my opinion on 'training' is different than most

edit: DOB = 1951