answer:We are biological creatures, prone to wear and tear, wrinkle and decay, and a general patina of being worn out. While that may look wise and worldly on some, most of us just look like ten miles of bad road. Add to that the weight of simply living. While some of us can live carefree without much loss or abandonment, many of us have known loss of life, emotional or intellectual disconnect, or apathy far too frequently. It wears on you physically. Even if you’re fairly zen with the impermanence if it all, it still takes its toll. Children have yet to experience any of that yet.