I just rode a century yesterday (see my thread in under general discussions). My job schedule doesn't provide any time for riding during the week, so all my training was on the weekends. I rode about 1200 miles before the century, most of which were 20 to 30 mile rides. The last month, I rode 50 to 60 miles on one day of the weekend and 30 or so on the other. While this is not a great training plan, I completed the very rolling century in 6-1/2 hours of riding time. And I will be 49 in a couple of weeks. Bottom line, if you can do a comforable 50, you can complete a century as long as you pace yourself, stay hydrated and eat. Good luck. If I can do it, anyone can do it!