As for my own answer:
Actually, of the things I want to do in my life, there aren’t many that I could still accomplish if I wouldn’t have a long life ahead of me in which to accomplish them. Most of them are long-term projects I’m already working on. For example…
* Become fluent in French; improve my German
* Learn Russian and Chinese
* Master Parkour
* Master at least one martial art
* Defeat my inhibitions
* And generally, make the best of all the possibilities of human existence, be they physical, intellectual, emotional, artistic or whatever.
Those are all things I want to learn. Cool skills that are surely fun to learn, but take a lot of time to master and would kind of lose their meaning if I’d die soon after mastering them. If I’d know I’d die next year, I’d give up on those things.
And then I’d be stuck with a useless year I’d need to fill up with something. I’d probably use my time on things that would probably be fun, preparations for kicking the bucket, or ways to just pass the time and make myself useful. Like…
* Sky diving
* Visiting Paris again
* Thanking my dear old mum and dad for everything they’ve done for me
* Charity work
So even though up there I pointed out there isn’t much difference between this hypothetical question and everyone’s actual situation in real life, I’m contradicting myself now by showing it can make a lot of difference after all for the things you decide to do.
[ Tl;dr: There’s much I want to do with my life, but it’s the sort of thing I’d have to give up if my days were numbered in double or single digits. ]