Do it!!! I've never done a century, but done several metric centuries, none of them with my guy--he's more the motorcycling type than the bicycling type. So I suspect that, judging by my own experience, one of two things will happen: 1. you'll just get into the groove of riding by yourself and you'll love it, or 2. you'll meet one or two others who are riding about the same pace as you and you'll all settle in together and urge each other on whenever necessary. In any case, you'll be SO PLEASED with yourself when you're done.

Have fun!!!