Tucked behind the breastbone sits a gland most people never think about — the thymus. New research suggests it may reveal something about how well a person is aging.
The thymus helps train the immune system early in life, then slowly shrinks and fills with fat as the years pass, until by late adulthood only a small patch of working tissue may remain. According to a study reported by ScienceDaily in June 2026, researchers at Mass General Brigham used artificial intelligence to examine routine CT scans from tens of thousands of adults, scoring how healthy each person's thymus appeared.
People whose thymus stayed in better shape tended to fare better over time, the researchers reported, with links to healthier aging and to surviving cancer. Two people of the same age, the scans suggested, can have thymus glands that look decades apart, one youthful and the other worn.
The scans were ones patients already had on file, taken for other reasons, which made the study large without any new tests.
The researchers are careful to call this an association rather than proof, and they say more work is needed before a thymus "score" could ever guide an individual's care.
Rick Good spent ten years in the newspaper business, including with The News & Observer (Raleigh, NC) and The Greenville News (Greenville, SC). He co-wrote, with Melinda Coleman, Rutledge to Riley: Governors of South Carolina, 1776–Present (Published by The Greenville News), and is the author of Mind Games Trivia #1 (Amazon). He has recently spent 15 years creating original trivia content through Sounds Good Mobile Entertainment and continues that with his new company, SGME Software. He edits The Smart Reader’s money, real estate, and business coverage.
