41 years old, type II diabetic, 298 pounds, and I still easily rode 50 miles today (50.19 actually). If I can do it then almost anyone can get into good enough shape to do it. My speed was only about 12.5 mph, but then I did go a bit slower for a friend who hasn't had much time on bike this summer. Not his fault sick parents and some health issues himself. My trek 7.3 did great, and I even added about 10 pounds due to carrying my trunk rack full of stuff. Next goal is a metric century. I love riding!