Love of life is not the same as fear of death. If the latter is what drives the search for longevity then it will never be enough. So long as longevity isn't used to find peace with life and death, and transcend our limited perspective on life then I see it as just a frantic attempt to delay the inevitable. Resisting death at 150 will be just as painful as resisting it at any other age. If on the other hand it will give people more time to gain wisdom and perspective on what life is about then that's a whole different story.