Researchers from the University of Palermo took samples from 45 people aged 75-90 years old who had parent born in Sicily 1900-1908.
Those who had parents that lived over the average age for italians before dieing had more naive B-cells, a type of white blood cells, than those whose parents died before reaching average age of dieing.
Perhaps having more of those type of white blood cells wards off infection in old age,making it more likely fior such a person to live longer.
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