I'm 46 and 270lbs. I would pay good money to be 210lbs again! Even at my weight and age, being on the bike feels great. I haven't lost an ounce, but my endurance is building all the time. My 10-mile route used to beat me up when I started several months ago, but now it just feels good. The lactic acid burn is gone from my legs and I'm surprised how much more they have to give than when I started.