I go cycling with my wife, and while I have been going a little longer, and more often, I try to beat my time every ride.
When I started out, my average speed was hovering around 11 mph, and its gotten up to about 16 mph.
Wondering if this was slow, fast? I don't know. I would think seeing a guy of my size coming at you going 16mph would be a weird site, but don't know.