Ten years? I agree with the above, that doesn't mean much to me. I've semi-planned my life out that far, but it could take many more directions.
Two years would result in a few more changes. I'd stop school and just travel, engaging in shenanigans. I'd tell people eventually, maybe turn it into an inspirational lesson about living for the day or whatev. Honestly, I wouldn't care that much. Not saying I want it to happen.

But I think I would just accept it and use what time I have, which isn't much different from living with a full life span, is it?