I'm 33 and have been commuting with a bike for about 8 years now. I currently ride approximately 2500-3000 kms (err... lemmesee... some 1600-1900 miles) per year and I'm happy to say that my yearly mileage is increasing.
So far I have packed my cycle away for the (relatively harsh) Finnish winter, but last autumn I finally went and bought studded winter tyres. Winter cycling has been a new discovery for me, and I will definitely continue cycling come next winter.
My other hobbies include kayaking, music and computers.