I'm 54 and started a year ago. I ride solo most of the time and don't have a speedometer. I know if I did, I'd worry too damn much about my speed and I wouldn't enjoy the ride as much. Funny thing is I seem to average 15 mph no matter what. It's not a precise average as I map the mileage and just divide by total elapsed time from when I walk out the front door until I walk back in. Some days I feel like I'm tired and not moving the bike at all. Other days I feel like I'm king of the world and am making great time. Some days I'll do a 20 mile loop, other days 35 with more hills. But when I add it up afterward, it's always the same average.