Last year I rode my first century, and my previous max was 45 miles (four years prior). I did a 32 mile ride earlier last year, and I mostly rode due to peer pressure. I primarily ride for transportation (lots of 10 to 20 mile days, and lots of stops), and I'm 6'5" 225 lbs. I did finish, but if I could recommend anything: make sure you read up on nutrition. I had some water, GU gels, jelly beans, and hammer packet, but I think you need some more Gatorade/electrolyte type drink, or more salts. My legs cramped really badly around mile 65, and I had to stop every 10 miles thereafter. If you can avoid making this dumb newbie mistake, and have a bike that fits, I think you will have a great ride! Good luck!