Part of it is our general wear and tear. The human body is active 100% of the time, even if we’re in a coma (depending on the nature of the coma). Your heart doesn’t stop beating, your lungs never stop inflating and deflating, and your brain never stops firing signals. Imagine having to drive a car for 35 years nonstop, it’d be practically a sign from a higher power if it hadn’t broken down at that point.
On another note, our bodies are trainable machines. You can train your body to do almost anything within reason, and part of why we’re more tired is because our lives are different. We work all day, probably sacrifice sleep and nutrition, and deal with stress. That said, we probably aren’t spending enough time training our bodies to be as healthy as possible. Typically, more effort needs to be devoted to maintaining our physical and mental health such as proper and consistent exercise, eating well, and taking rest when possible.
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