At age 81 I have slowed down a bit. Not as fast, not as far, but still ride 6 days a week.
Spouse and tandem partner rides tandem with me every other day, but she is only 79.
Currently averaging 5,000 miles a year.
In the 'old days' averaged 10,000 miles a year for about 20 years. We do live in Arizona where we can ride 13 months out of the year . . .
Highest mileage year was just a tad over 13,000. We did most of that on a tandem bicycle with my wife as stoker.
After the high mileage year she asked . . . "now that we are grandparents, think we could back a bit on the miles??"