Optimist vs. Pessimist…

I heard of a report in the news that says that pessimists live longer than optimists. Something to do with them being naturally more cautious because they fear the worst where as optimists will be more fool hardy as they think everything will be alright. 

However I wonder if either of these groups will think that these figures don’t apply to them as a true pessimist would surely believe that he will be the only pessimist not to live longer, and an optimist will believe that he is the only optimist to buck the trend and live to a grand old age.