61? All-out type? Never scale it back? 6 hard training days per week?

Check back with us in a decade, let us know how the body feels. Who knows your future?
If you are training to feel good and stay active until you die, I would suggest some rest days or 'small ring rides' when you feel overly tired..TaiChi or Yoga over MMA.
Training for a competitive event, then Go For It. And good luck to you.


Lots of programs available for seniors. A good program should include low impact aerobics and strength training.
My exercise cardiologist told me to eliminate lots of things. No riding mower, no powered leaf blower, no electric hedge trimmer, no elevators/escalators, etc. Basically, she instructed me to Find Joy in Movement, forget all the 'human-energy saving devices'.

The best results (non-competitive) are achieved with a lifetime of consistency over intensity.
YMMV.