Great accomplishment. I am 70 years old (took up cycling at age 62), and just did my first century this past Saturday at the Big Dam Bridge 100 in L. Rock, Ar. It was actually 105 miles. I have been gradually working my way up to the century, with my longest ride being 73 miles. I was well prepared for the eating, drinking, pacing part. I think the hardest part for me was the mental will to get through it after about mile 85. Everything started hurting . But I got through it, and am already looking forward to my next one.