I used to ride when I was in my 20s and now have returned and bought a new Felt Z100 and remember why I loved riding. I am 55 years old and had 4 way by-pass surgury about a year ago. I was 225lbs when I started riding and this morning I was 200. Looking to get down to 175, so I am halfway to my goal. I ride about 8 miles in the mornings and Saturdays about 20 to 25 miles. I only average about 14mph over these rides and am a little discouraged when I see the others saying they average 20!! Looking forward to my next ride!