I'll be 69 this year, 5' 10 3/4" (used to be 5'11") and weigh 193, headed to 185. My more or less flat course is 45 miles and I average 18 or so. My most ridden hill route is about 32 miles with 1700 feet of climbing and I average about 15 on that route.

When my arthritic knees act up, my averages go to 16 on flats and 14 on the hills. I did about 6k last year, will do the same this year if the knees hold up.