I started riding lots of miles when I was 40 - it's six years later and this year I got in 8100 miles. Commuting helps a whole lot; I got the Xtracycle in February and the Gazelle Dutch Commuter in October or November so next year I'll have even fewer car miles in Jan and Feb. though I don't know if I"ll have a competitive thing with "Howard" on bikejournal to motivate me to do a November century and get 700+ miles in November and December again!