An integrated analysis of 1.32 billion T cell receptor sequences from nearly 5,900 individuals across 14 cohorts found that peripheral repertoire diversity declines nonlinearly with age, with the rate of loss accelerating markedly after approximately 50 years. Sex and chronic cytomegalovirus infection further modify the trajectory, and in patients with cancer, higher TCR diversity was associated with improved overall survival independent of age, sex, and CMV status.
Key Points
- TCR repertoire diversity declines sharply after roughly age 50
- Sex and chronic CMV infection modify the rate of decline
- Higher diversity predicted longer survival across multiple cancer types
Longevity Analysis
Immune aging is not a smooth linear slope but a trajectory with an inflection point in midlife, which narrows the window in which surveillance capacity can be preserved rather than recovered. Chronic viral burden such as CMV acts as a persistent drain on that capacity, making the reduction of lifelong antigenic and inflammatory load as consequential as any intervention added later. Peripheral repertoire diversity offers a quantifiable readout of how well the body still recognizes threats, and its association with survival in cancer positions it as a functional marker worth tracking alongside conventional measures of biological age.
Original published by Wiley Aging Cell, by Naja Lange, Asbjørn K. Attermann, Randi Istrup Juul, Laura Andersen, Iver Nordentoft, Leon Eyrich Jessen, Nicholas McGranahan, Hugo J. W. L. Aerts, Lars Dyrskjøt, Nicolai J. Birkbak .