The old retired guys bike a ton and are fast! I discovered this while commuting and some of those folks are now strava friends. Since 2013, my commute has been about 30 miles per day. One job was 16 miles each way and currently 22 one way and train + 6 on the return. I'm old enough to know better :-) I've been biking in the mornings before plunking down on the couch to work for the day.