Little Mama is petite, weighing about 100 pounds, and the only physical indication of her age are the gray hairs on her chin.
CNN: Meet one of the oldest chimpanzees in captivity
The researchers believe a person's immunological parameters could provide an indication of their true biological age.
BBC: Biological clue to why women live longer than men
"It is an indication that more parts may be showing their age, " Erickson said.
CNN: Mars rovers working overtime
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