Aging: Only humans have grey hair?
No, humans are not the only species that have grey hair as they age. Many other mammals also exhibit the greying of hair as they get older. For example, dogs, cats, and horses can all develop grey hair as they age.
The greying of hair is primarily due to a decrease in the production of melanin, the pigment responsible for hair color. As animals age, the cells responsible for producing melanin gradually decrease in activity or completely stop functioning. This results in a loss or reduction of pigment, leading to grey or white hair.
It’s worth noting that not all individuals within a species will develop grey hair at the same rate or to the same extent, as the aging process can vary depending on genetic factors and other environmental influences.
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