I'm not too bothered about when and how. I mean clearly a long life is preferable, but I don't see any need for it to be a great and noble thing, or particularly awesome. If I drown saving some kid's life, what makes that a better death than saving some kid's life, surviving, and getting hit by a bus the next day? Make the most of your living days. Don't wait until you die to be awesome. Anything worth dying for is worth living for, too.
I'm an organ donor and if I don't get the full use out of them (ie I die young), it would be nice if they were salvagable. Unfortunately I have a feeling that it will happen by me catching fire. But oh well, it means I'll go out doing something I love (being on fire, apparently).
In any case I'm not really afraid of what comes after. That's part faith, and part dying in enough dreams to be actually pretty comfy with oblivion. Yeah I don't wake up or have blind panic in those dreams, I just kind of drift for eons. It's kind of nice. If there's nothing after, I'm cool with it. If there's reincarnation, I hope I'll come back as something awesome. If it's some other kind of eternal reward, I'm satisfied that I'll wind up on the good end of the scale.