I submit this without comment.
Without shame.
Only to say - it seems to deal in generalities.
Is there a skew with ridewithgps?
Take it for simplistic, but valid?

How Far Should You Be Able To Bike? Here’s What the Data Says

60-70©Photo: This age group sees a noticeable leap in distance, averaging 22 miles per ride – that’s 35.4 km.

The 70–80 age group tops the chart at 22.3 miles or 35.9 km per ride.

Even in their 80s, many cyclists are averaging 19.2 miles – roughly 30.9 km.


Wow. Big numbers. How many miles on roads?, or on flat trails?

Remember - Opinions are your own.

I'm almost 74. Soon to start 75 revs around the Sun. 15 miles three/four times per week with a session of hard aerobic and strenuous climb in each satisfies my basic needs. But it is all from home on local semi-rural roads. Trails that are muchly flat or gentle would raise the mileage. 100 miles/wk was always a realistic goal in my 60's. 60/70mi/wk is closer these days to being realistic, 100 mI if the e-bike is used exclusively.