How does aging work?
The human body goes through a variety of changes as it gets older. In general, muscles , blood vessels and other tissues lose their elasticity. The heart becomes less efficient, bones become weaker and the metabolism slows down. Aging affects every part of the body — check out the Mayo Clinic’s summary of how aging affects each of the body’s organ systems here . In spite of the changes to the rest of the body, a lot of people focus primarily on changes to their appearance as they age. Americans spend billions of dollars per year on products to treat the external signs of aging. These include: • Wrinkles: Fibers in the skin called collagen and elastin break down and lose strength as a person gets older. Sun exposure throughout life contributes to this process. Without these fibers, the skin cannot hold its shape as well. Older skin retains less fat, making it look less supple. The pull of gravity also causes the skin to sag. • Dry skin:
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