I'm 31 yrs old, 5'10", and about 190lbs. I just started riding August 1st and can avg 18mph solo and about 19mph with a friend. This is for about a 15 mile trip. I as increase mileage, I have to reduce speed a little. Right now I'm still way out of shape but I'm working on it.

Edit: My averages are computer avg, not cruising speeds...