There is no doubt that everyone's conditioned beliefs and state of mind correlates with disease and even longevity.
But, why on earth would anyone want to physically live forever. What a bore, even if you could maintain youthfulness. Better to achieve "eternal aliveness" by transcending ego beliefs and resurrecting the Christ Self/Buddha nature (authentic Self) in the now. Then when you choose for this body to die, move on to another interesting experience and contribution in the next life.