Made my son get up this morning and go for a ride. I have to drag him away from the video/computer screens once in a while! We rode my usual 22.4 miles again, the longest he has ridden in a couple years. He's 12 and in good shape, so it didn't bother him. I am trying to get him to ride the length of the trail with me this fall, we'll see!
There is no such thing as a pathetic average MPH im opinion.
I don't really try for speed, I just enjoy being out there. I used to average 14-15 mph, now I seem to be in the mid-13's. I do keep a fairly high cadence, so I am getting some good exercise, which is why I am out there in the first place. It would be nice to be able to keep up with some of the 65 year old guys though as I am only 45!