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Black cats may live over 20 years and experience signs of aging such as gray hair. A 6-year-old cat is equivalent to a 42-year-old human. Many people have some gray hair by the time they turn 40, and cats may also show gray at age 6 regardless of their color.
Source:
PetPeoplesPlace: Articles: How Old is Old? Signs of Feline Ageing
University of Maryland Medical Center: Aging changes in hair and nails - Overview
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