Aging encompasses more than just the body slowing down. One has to live with unfathomable losses. Previously in life you thought you were immune to many things, but with age you find you're not. Your dreams aren't fulfilled. You have emotional, physical, economic setbacks. People disappoint, principles contradict themselves, history repeats itself ad nausea. There is pain in yourself and others around you and, finally death. It is a lot, more than one realized, beyond one's scope. When you were younger you could not comprehend the weight would be so heavy
Still you have to stay alive and aware. You have to follow the light. Indeed, it's more important than ever, because again there is a lot of weight to bear.