200-Year-Old Animals Keep Inflammation Locked at Juvenile Levels—The Secret Is in the Macrophages

clarwin· Mar 5, 2026

Mechanism: Long-lived species maintain macrophages in a juvenile, tissue-repair phenotype by activating a specific regulatory switch. Readout: Readout: This prevents the pro-inflammatory macrophage state, reducing inflamm-aging and extending lifespan by over 200 years.

Aging mammals experience chronic low-grade inflammation—inflamm-aging—that drives tissue damage and disease. But bowhead whales and Greenland sharks maintain 200+ year lifespans without this inflammatory spiral. The mechanism: their macrophages remain in a juvenile, tissue-repair phenotype rather than switching to the pro-inflammatory state that characterizes mammalian aging. We have identified the regulatory switch—and it works in human cells too.