Cancer rates are rising in adults under 55, and new research suggests accelerated biological aging may be one piece of puzzle. Scientists found people from more recent generations tended to have bodies that appeared biologically older than those of earlier generations at same chronological age.
Greater biological age acceleration was linked to higher risk of early onset cancers, with specific patterns seen for lung, gastrointestinal, uterine and colorectal cancers. Cancer is strongly associated with age. Longer people live, more opportunities cells have to accumulate damage that can contribute to tumor growth. But cancer is increasingly being diagnosed in younger adults, and each newer generation appears to face greater risk than one before it.
That trend prompted researchers to investigate provocative possibility: Are younger generations accumulating biological damage more quickly, causing bodies to age faster than expected?
WashU Medicine Study Offers Evidence Younger Generations Aging Faster
Study led by researchers at Washington University School of Medicine in St Louis offers evidence this may be happening. Team found signs younger generations are aging more rapidly on biological level than older generations did at comparable ages.
Scientists are still working to understand what is driving changes. Question is being investigated through international efforts involving research members of Siteman Cancer Center, based at Barnes-Jewish Hospital and WashU Medicine, and Cancer Grand Challenges, global initiative co-founded by National Cancer Institute and Cancer Research UK.
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mportantly, researchers also found accelerated biological aging was associated with greater risk of early-onset cancers among younger generations. In general, early-onset cancers are those diagnosed at age 55 or younger.
Gap Between Biological Age And Actual Age Explains Risk
Chronological age simply measures how many years person has been alive. Biological age, by contrast, reflects how old body appears based on measurable changes in cells, organs, metabolism, and other physiological systems.
According to researchers, cancer risk increased as difference between biological age and chronological age grew. People from more recent generations tended to have larger gaps than those born earlier, suggesting bodies appeared biologically older at same chronological age. That generational shift could help explain at least part of rise in cancer among younger adults. Team also found aging did not appear to affect every organ system in same way.
Faster aging in specific parts of body was associated with particular cancers. Immune system that appeared biologically older, for example, was linked to early-onset lung cancer. Older-appearing fat tissue was associated with early-onset colorectal cancer.
Findings were published in journal Nature Medicine. Researchers say measurements of accelerated aging could eventually help doctors identify younger people who face unusually high cancer risks, potentially allowing prevention or screening to begin earlier.
“Our ultimate goal is to decode how modern environments become biologically embedded to drive cancer risk, transforming prevention from broad recommendations to personalized interventions,” said Yin Cao, ScD, molecular epidemiologist and associate professor of surgery and medicine at WashU Medicine.
“This brings us closer to identifying risk earlier and developing prevention strategies tailored to individual’s biology,” Cao added.
Looking Beyond Individual Cancer Risk Factors
Cao’s team previously studied numerous factors that can shape cancer risk over person’s lifetime, including obesity, metabolic dysregulation, alcohol consumption, sedentary behavior, poor diet quality and cesarean delivery. Each factor can provide clues about why cancer develops at younger ages. However, no single factor appears to explain very much of overall trend on its own.
That led Cao, who is also research member of Siteman, and colleagues to look for broader way of measuring how many different influences may work together over time to increase cancer susceptibility. Support from Cancer Grand Challenges allowed Cao, as co-lead of Team PROSPECT, to investigate question on much larger scale.
For new study, researchers examined data from more than 154,000 young adults enrolled in UK Biobank, which contains extensive biological, health, and lifestyle information.
They also analyzed more than 10,000 participants in United States who are part of National Institutes of Health’s All of Us Research Program, initiative designed to create comprehensive health database involving more than 1 million people living in US.
Measuring How Fast Body Is Aging – PhenoAge And Organ Clocks
To determine biological aging, researchers, including first author Ruiyi Tian, doctoral student in Cao lab, looked at two different scales.
One was systemic aging, which measures aging across body as whole. Other was organ-specific aging, which estimates how rapidly individual organs or biological systems are aging.
For systemic aging, researchers relied on established approaches that use clinical biomarkers, including PhenoAge and Klemera-Doubal Method. They also used metabolomic age score designed to capture age-related patterns in person’s metabolism.
PhenoAge, for example, uses nine blood biochemistry markers to estimate biological aging. These include albumin, made by liver, and creatinine, waste product removed by kidneys.
For organ-specific aging, researchers analyzed blood proteomic data, which measure levels of numerous proteins associated with specific organ systems. Those protein patterns were then used to estimate biological age of individual organs. Team calculated average difference between biological and chronological age within each birth cohort. They then used standard deviation to measure how far each group differed from overall study average.
Analysis: Younger Generations Show Older Biological Profiles In UK And US
Generational differences were apparent in both UK and US populations.
Among UK participants, people born between 1965 and 1974 had systemic aging that was 23% of one standard deviation higher than people born between 1950 and 1954, even after chronological age was taken into account.
Put more simply, members of younger generation tended to have slightly older biological profiles than members of older generation when researchers compared them at same chronological age.
Even larger difference appeared in US data. Participants born between 1990 and 1999 had systemic aging that was 92% of one standard deviation higher than those born between 1965 and 1969. Researchers then examined whether these biological aging differences were connected to cancer.
Faster Aging Linked To Early-Onset Cancer – Lung, GI, Uterine
Greater systemic aging in younger group was associated with 8% increased risk of early-onset solid cancers. Strongest associations involved lung, gastrointestinal, and uterine cancers. When participants were separated into three groups according to level of systemic aging, another pattern emerged. People with most advanced systemic aging had 15% increased risk of early-onset solid cancer compared with participants showing least advanced aging.
Association remained even after researchers accounted for inherited genetic cancer risks and genetic susceptibility to accelerated aging.
Looking at individual biological systems revealed more specific connections. Advanced immune system aging was associated with higher risk of early-onset lung cancer. Advanced adipose fat tissue aging was linked to higher risk of early-onset colorectal cancer.
“If we can identify younger people with highest cancer risk when they are still healthy, we can focus on prevention and early-detection strategies for individuals who will benefit most from early interventions,” Cao said.
Searching For Causes Of Cancer In Younger Adults Worldwide
Research is part of Team PROSPECT, Cancer Grand Challenges team co-led by Cao. Cancer Grand Challenges is international research funding initiative co-founded by Cancer Research UK and National Cancer Institute, NCI. It brings together scientists from different specialties and countries to investigate most difficult problems in cancer research. One of those problems is explaining why early-onset cancers are becoming more common.
“Right now, we don’t have definitive answer to what’s driving rise of early-onset cancers around world, but studies like this are helping us piece together bigger picture, showing that cancer may be influenced not just by changes inside individual cells, but by wider changes happening across body as whole,” said David Scott, PhD, director of Cancer Grand Challenges. Cao and colleagues now working to better understand why cancer increasingly affecting younger generations. Major focus is determining how changes in environment, lifestyle and society may leave long-lasting biological marks on body.
Those effects could include accelerated aging as well as other signs that make some people more vulnerable to disease. By tracing how risks accumulate throughout life, researchers hope to uncover more of biological origins of early-onset cancers. Ultimate goal is not simply to understand why cancer develops earlier, but to identify people at elevated risk while they are still healthy. That could make possible to move prevention and screening earlier and tailor interventions to individual’s biology, shifting cancer care toward stopping disease before it begins.
Q&A
Q: Why are cancer rates rising in adults under 55?
A: WashU Nature Medicine study of 154,000 UK Biobank adults finds younger generations have biologically older bodies; faster systemic aging linked to early-onset cancers.
Q: How much does accelerated aging increase early cancer risk?
A: Greater systemic aging associated with 8% increased risk of early-onset solid cancers; those with most advanced aging had 15% higher risk vs least advanced.
Q: Which cancers are linked to accelerated biological aging?
A: Strongest links for lung, gastrointestinal, uterine cancers; immune system aging linked to lung cancer, fat tissue aging linked to colorectal cancer.
FAQ
1. Where was early-onset cancer biological aging study published?
Study published in Nature Medicine, led by Yin Cao ScD at Washington University School of Medicine, with data from UK Biobank and NIH All of Us.
2. How was biological age measured?
Using PhenoAge nine blood markers, Klemera-Doubal Method, metabolomic age score, and organ-specific aging via blood proteomics for individual organs.
3. How big is generational aging gap?
UK participants born 1965-1974 were 23% of standard deviation biologically older than 1950-1954 cohort; US 1990-1999 cohort was 92% SD higher than 1965-1969.
4. Does accelerated aging explain all early-onset cancer rise?
No single factor explains trend; researchers say accelerated aging is one piece, alongside obesity, diet, alcohol, sedentary behavior, and environmental factors.
5. Can biological age testing help prevent cancer in young adults?
Researchers say measuring accelerated aging could eventually identify high-risk younger people for earlier prevention and screening tailored to biology.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult qualified healthcare professionals for cancer screening, prevention, and risk assessment based on family history and lifestyle.
