Which body measurements best predict early death
Which measurement of your body best predicts how long you will live? Researchers lined up dozens of known biomarkers and reached a surprising answer: the best predictor is not what most people expect.
Biological age and calendar age are not the same. Someone aged sixty may be forty at the cellular level, or eighty. But which tool captures that difference most accurately? That question drove a study using the LBC1936 cohort: 861 people born in 1936, measured every three years between ages seventy and eighty-nine.
The researchers compared epigenetic clocks, organ-specific protein profiles, functional measures like walking speed and grip strength, brain volume, lung function, and telomere length. Telomeres are the protective caps on chromosomes; their shortening was long considered a key marker of aging. In this study, however, telomere attrition in white blood cells showed no significant relationship with mortality.
GrimAge2 comes out on top
The epigenetic clock GrimAge2 showed the strongest association with all-cause mortality. This clock combines multiple blood proteins and DNA methylation patterns into a single measure of biological aging. Organ-specific age gaps, particularly for the liver, immune system, heart, pancreas, and brain, were also strongly linked to mortality.
At the same time, some functional measures proved at least as predictive as molecular clocks. Total brain volume, grey matter volume, overall cognitive performance, and two measures of lung function predicted mortality as well as or better than many blood-based markers.
Complementary rather than overlapping
Notably, the biomarkers showed little overlap with each other. A person with a high biological age in one organ did not necessarily show the same in another. This confirms earlier findings that organs age largely independently of each other.
GrimAge2 did correlate broadly with the other markers, making it a particularly powerful composite instrument. The cautious lesson for longevity research: no single measurement is sufficient. Understanding your biological age likely requires multiple data points.
Search terms to explore further: epigenetic clock mortality risk, organ biological age proteomics, GrimAge DNA methylation