I'm going to live to 100.

According to this article, anyway, summarizing new analyses of a 90-year long follow-up study of over 1,500 Americans. (Emphasis below added by me.)

See this:

Reality:  One of the best childhood personality predictors of longevity was conscientiousness — "qualities of a prudent, persistent, well-organized person, like a scientist or professor — somewhat obsessive and not at all carefree," the authors conclude.

And this:

The authors also looked at a study of Medicare patients that found that "neuroticism was health-protective."

I found it comforting :)