I started riding a rode bike last March, so it's been a year. I try to ride two times a week, one a 20-25 mile ride and the other a longer ride, usually 40-50 miles. This past weekend, I rode the longest of my short riding career, 57 miles. I would like to do a century ride, but that 57 miles was hard. I turned 60 this past December and the leg muscles aren't developing as fast as I would like. My question is, how long should it take to develop the strength and endurance to do a century? I know it's a pretty vague question, but thought I would generate a little discussion regarding strenght and endurance for us older folks. Thoughts?