Younger Generation's 'Biological Aging' Faster... Cause of Early Cancer?

A growing number of young adults are being diagnosed with cancer, a trend that challenges the long-held notion that cancer is primarily a disease of aging. Recent research suggests that younger generations may be biologically aging at an accelerated rate, a phenomenon that could be a key factor in the rise of early-onset cancers.

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The key to this study is biological aging. This is not the chronological age based on your birth year, but an indicator of how old our body actually is.

Scientists at Washington University School of Medicine in St. Louis have identified a significant clue: individuals born in more recent generations are aging faster biologically, even at the same chronological age, compared to their predecessors. This accelerated aging, measured by a gap between one's biological and chronological age, has been linked to an increased risk of developing cancer before the age of 55.

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The researchers defined the difference between biological age and actual age as the 'age gap'. The larger this gap, the higher the cancer risk.

The study, published in Nature Medicine, analyzed blood biomarkers from over 150,000 participants in the UK Biobank and the U.S. All of Us Research Program. Researchers assessed biological age using nine blood biochemical markers and also examined organ-specific aging by analyzing proteins in the blood. They found that a larger 'age gap' correlated with a higher cancer risk, particularly for solid tumors like lung, gastrointestinal, and uterine cancers.

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This trend could be an important clue to explaining the global increase in early-onset cancer.

While the exact reasons for this faster biological aging in younger generations remain unclear, researchers are investigating the roles of environmental factors, lifestyle choices, and societal changes. The findings suggest that identifying individuals with a faster biological aging rate could offer a new paradigm for cancer prevention, moving beyond treatment to proactive risk identification.

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The researchers expect that identifying how quickly biological aging is progressing relative to actual age could help identify young adults who are at high risk for cancer in advance.