I'm 53 and ride almost 50 miles a day (and ride 5 days a week). I routinely pass a couple of guys that I know are commuting the same range I am as my start time varies and I'll pass them either at the beginning or end of my ride. They're either a lot older than me or they're kids and all that riding makes them look near retirement age

And 40 miles 1 way is nuts. That's like 2 hours at a solid clip each way.