GREYCOVER

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Going Grey

The biology behind grey and white hair — how melanin production slows with age, the hydrogen-peroxide buildup behind premature greying, and what growing older does to a strand of hair.

Grey hair

Grey hair

Poliosis

Poliosis

Old age

Old age

Catalase

Catalase

Reactive oxygen species

Reactive oxygen species

Centenarian

Centenarian

Wrinkle

Wrinkle

Senescence

Senescence

Grandparent

Grandparent

Gerontology

Gerontology