Id like to know where you can find flat windless terrain for more than an odd day or two and during those days for more than an hour or two.. But assuming I can find it I can motor along at 16/17 mph without killing myself and can go to the drops and do 18/19 and hold that until I have to stop, turn around or slowdown for traffic etc., which seems to be at least every couple of miles.

Im 62 and Im somewhat faster now than a couple of years ago due to weight loss, weight training better flexibilty and more cycling. So if even old farts can improve the sky can be the limit for you..