reminds of my dad actually... few years older than JC, and health significantly declined in the past few months, even hair loss also noticeably worsened
Suspect throughout our lives, really need to continue the grind. VO2max, zone 2, absolute strength (deadlift, squats, pull up, dips), plyo or any explosive training (the other part of neuro work other than strength and VO2max work......yes VO2max sessions do significantly stress the nervous system, much more than easy paces).
Mobility work and simi "chaos" training as in sudden directional changes etc.
Actually i read before cycling (balancing) and the split second decision making helps also.
Plus of coz, our fav Creatine.
Life long man.......