" A thought experiment: Imagine a woman growing up on a desert island entirely alone. Does she age? She will develop wrinkles, and inevitably health problems. She will slow down. But is this aging? Beauvoir didn’t think so. For her, aging was cultural, a social verdict rendered by others. If there is no jury, there is no verdict. The girl on the island will experience senescence, biological deterioration, but she will not age. "

― Eric Weiner , The Socrates Express: In Search of Life Lessons from Dead Philosophers