A new study published this week in Nature Medicine reports that younger generations appear to be aging biologically faster than earlier ones, even when compared at the same chronological age. The researchers say the pattern may be associated with higher rates of cancer before age 55, but they stress the findings show correlation, not proof of causation.
The study was led by Dr. Ruoyi Tian of Washington University School of Medicine in St. Louis and used data from the UK Biobank. Using advanced proteomics, the team measured organ-level “aging clocks” to compare how biological aging differs across age cohorts.
The results showed a clear generational gap. People born in the 1990s had biological aging levels nearly one standard deviation higher than those born in the mid-1960s when assessed at the same age. The researchers say that difference corresponded to about an 8% higher risk of early-onset cancer, especially cancers of the lung, digestive system and uterus. In an earlier analysis using blood biomarkers and the PhenoAge measure, the same team found that people born after 1965 were 17% more likely to experience accelerated aging than those born in the early 1950s, and each standard deviation increase in biological aging raised early-cancer risk substantially, up to 42% for lung cancer.
The new work also examined aging in specific organs. Faster aging of the immune system was linked to early lung cancer, while faster aging of fatty tissue was associated with colon cancer. Researchers say this could eventually help identify high-risk groups earlier through advanced blood tests.
Experts cautioned that the study does not prove that accelerated aging directly causes cancer. They noted that biological age is influenced by diet, exercise, mental health, and exposure to infections or pollutants. The findings, they said, add to a growing global concern about rising cancer rates among younger adults, which the U.S. National Cancer Institute has also flagged as an emerging public health challenge.
