The trick is to realize that after giving your best, there's nothing more to give.
It is a bore, I admit, to be past seventy, for you are left for execution, and are daily expecting the death-warrant; but it is not anything very capital we quit. We are, at the close of life, only hurried away from stomach-aches, pains in the joints, from sleepless nights and unamusing days, from weakness, ugliness, and nervous tremors; but we shall all meet again in another planet, cured of all our defects.
I should consent to breed under pressure, if I were convinced in any way of the reasonableness of reproducing the species. But my nerves and the nerves of any woman I could live with three months, would produce only a victim... lacking in impulse, a mere bundle of discriminations. If I were wealthy I might subsidize a stud of young peasants, or a tribal group in Tahiti.