Been biking much of my life. Actually prefer hiking, and climbing trees, but I really enjoy biking! Rode more in my 40"s than at any other age [averaged 30 miles per day back then; everyday]. Knee and back injury stopped that. Do about 14-15 per trip four or five times a week and walk about 5 - 6 miles 5x per week. Back to combining my biking with photography again.
As a retired teacher I don't climb tall trees anymore, but just got a new road bike and having a blast! [I sure do miss those 60+ footers though!]
Safe biking all!