Some age-related physical changes are obvious: an extra laugh line or two, graying hair, and additional weight around the waist, for instance. But many changes, such as the gradual loss of bone tissue and the reduced resiliency of blood vessels, go unnoticed, even for decades. Even though you're not aware of them, they're happening, nevertheless. Knowing how and why your body alters with age will help you prepare for changes in cell, tissue, and organ function that cause the body to slow down. This knowledge will also help you take steps to stop the development of conditions such as diabetes and eye disease that are more common with advancing age.

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• resiliency 回復力
• diabetes 糖尿病