Researchers tracked nearly one thousend 38-year-olds and found the rate at which participants aged varied widely. The subjects “biological age” ranged from under 30 to more than 60(!!), despite all having the same “chronological age.”
The study looked at a young, healthy population to see what the differences were overtime for them; as opposed to looking at older people who are already elderly, some were sick, some healthy, and trying to figure out in retrospect how they had stayed healthy.
Read the full study on (PDF FILE, 14 pages):