There is only one solution if old age is not to be an absurd parody of our former life, and that is to go on pursuing ends that give our existence a meaning — devotion to individuals, to groups or to causes, social, political, intellectual or creative work… In old age we should wish still to have passions strong enough to prevent us turning in on ourselves. One’s life has value so long as one attributes value to the life of others, by means of love, friendship, indignation, compassion.
Simone de Beauvoir via The Marginalian