There's a rather interesting website called Death Clock (http://www.deathclock.com/) where you enter your birthday, gender and body mass index (BMI) and it calculates your day of death. Though it sounds ominous, its intent is to make you aware of every moment, and the impact of your outlook on your mortality. At the moment, it thinks I'll live to be just shy of 98, which is rather comforting.
I used to answer no to this question, but there's a part of me that would now be curious. And of course, I'd want to know the reliability of the predicted date: if a psychic were to say it was so, I'd treat it with a grain of salt. I know of a friend whose former husband said he knew he was going to die at 33 and he did.
Regardless of the answer, we do need to live in every sweet moment and always feel resolved that we are living the best manner possible, so that if does come, we can go in peaceful acceptance. Great question!