73 and I train and race at the track and race time trials.

And I was cycling in Greece last year. I like the cycling and it was interesting and challenging.

Last night, I returned from Aguascalientes Mexico where I was training at the indoor velodrome while my wife, age 72, was racing. Aguascalientes is 6200’ but typically measures out at 8300 to 9300’ according to my Kestral weather meter depending on various atmospheric conditions. I was doing high intensity efforts at altitude - 500 meter accelerations, kilos and etc.

I am getting ready for the masters world track championships in LA in a month. Generally, I do at least 2 track / HIIT style sessions per week. However, I am a shorter / middle distance rider.

And I can bias my muscle composition and physiology toward the middle distances but it is not my best. Generally I get about 5000 to 7000 miles per year. At Aguascalientes, these past 20 days, all I have ridden is track and I have about 180 miles of distance on the 250 meter track - lots of motor paced endurance work at 25 to 27 miles per hours using a 106 gear inches.

With respect to aging, I like Clint Eastwood’s latest quote when at age 91, he is making another movie. He was asked if his age is a problem and Clint said, do not let the old man in.

IMO, as I age, I am focusing at lot on mobility and strength. For me, the skeleton and strength is where the action is. If my skeleton and strength are bad, it is a very tough day on the bike at any intensity or duration. YMMV