I'd just keep living. I'd take more risks and be more heroic, granted, but I think I'd just go on being a person, living my stuff. No one has to know, either. Presumably I could fake my own death at some point just before my failure to age became apparent, and then send a little message to all my loved ones telling them not to worry, that I couldn't contact them again in person but I was fine, and then go off to do some stuff. Just keep on living. Adventure. Go wherever I wanted. I don't have to worry about eating anymore, so I could just hitchhike across the continent or walk, if need be. Money doesn't matter that much anymore. I've always been pretty okay with going for a long time without conveniences, so long as I know that someday soon I'll have them back. The lack of showers might be annoying, though. After a while, that'd probably get boring, and I'd want to settle down, have a proper life with a family somewhere. Which I could get eventually, being immortal and all. Of course, one day I'd have to leave them behind to, and so on and so forth, but I honestly believe I could handle that. That's kind of a neat idea. An immortal guy, traveling all over the world, living lifetimes, most small and inconsequential, but some grand and important, and then moving on. Pockets of people, all knowing the same man by different names and in a different life. It's probably been done before, but I still think it's cute.