I’m 85 and physically very healthy. I feel this is because my mind is peaceful as a result of my cultivating altruism.
My favourite prayer says: "For as long as space endures, And for as long as living beings remain, Until then may I too abide, To dispel the misery of the world."
And, in trying to fulfil that aspiration, I feel my life has been of some benefit.
Dalai Lama