I'm also gonna echo the sentiments of these other 41ers and say...it's going to be very VERY difficult for you and your wife to do this. A century is something you train for, especially if you're new to cycling. To expect it to be doable out the gate, not realistic. If I were you, I'd try and do a 90 mile ride with your wife this weekend and see how far you can get. Not to be Debbie Downer, but I'd be surprised if you both made it 40 miles. Just being realistic.