Personally, when it comes to life, I value quality much more than quantity. So, rather than pine over the length of my life and if I could have enough control to extend it beyond its natural lifespan, I would much rather concentrate on making the years I know I have worthwhile. I would much rather live a fulfilling life of 75 years than a life of 300 years full of 'what if's' and 'should have's.'
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell