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Getting the latest healthcare news for you
Getting the latest healthcare news for you
Aging looks different at the molecular level for everyone, a landmark eight-year study confirms. Tracking 335 women over time, researchers found that genetics, circadian rhythms, seasons, and environmental exposures like "forever chemicals" all shape unique biological aging paths. The findings open the door to far more personalized approaches to predicting and preventing age-related disease.
Forget a one-size-fits-all aging clock — a sweeping eight-year study published in Science shows that molecular aging is deeply personal. Led by researchers at King's College London, the MultiMuTHER study tracked 335 female twins, repeatedly measuring blood gene activity across ~16,000 genes and hundreds of metabolites. The result: two healthy people of the exact same age can be aging in surprisingly different — sometimes opposite — ways at the molecular level.
The culprits behind this variation? A mix of genetics, time of day, seasonality, and environmental exposures. Notably, blood levels of PFAS ("forever chemicals") left detectable molecular fingerprints over time, underscoring how public health efforts to reduce environmental toxins could have real biological payoffs. The study also revealed a complex immune system reshuffling with age — innate immunity staying active or even ramping up, while adaptive immunity declines, potentially fueling chronic inflammation.
Key Takeaways:
Why it matters: This research lays the groundwork for precision medicine approaches that go beyond chronological age — helping clinicians identify who is at higher biological risk earlier, and tailor interventions before disease takes hold.
