Eternal youth. In my eyes, life is not worth living unless I am young. I won't be alive by the time I'm thirty years old.
Etermal Youth. I live more for a cause than I do for my family or friends. Also, it is near impossible for me to get sick if I have access to good food. (I know how to use it well.)
Not to mention, I have been very lucky in avoiding injury thus far.
Immunity/indestructibility. Sounds cool.