A century is always a big deal for anyone. That is a lot of miles and hours. There is no easy century. That is like saying an easy marathon. It just doesn't happen and when you add in your present ride then it means all the more.
I would suggest in the future carrying more food on you such as a gel or two or three, id, and a small wallet. I carry a business card case which is small but effective. I try to have 50 dollars, id, and a credit card. I've used all at one time or another. The money is there because plastic doesn't always work.
Good luck with the new bike and enjoy yourself. I'm from Pittsburgh so I know your hills.