Reza Gheitasi, Mahnaz Rezaei, Parvaneh Nafisi Fard, Daniela Roel, Sabine Baumgart, Diana Dudziak, Norman Rose, Simon M Petzinna, Thomas Kamradt, Carsten Watzl, Mathias W Pletz, Valentin S Schäfer
Immunosenescence is not a uniform decline but a trajectory shaped jointly by age and sex. Using continuous high-dimensional immunophenotyping, we show that aging T cells accumulate a senescent signature of CD28 loss and CD57 gain, and that males reach an inverted CD4:CD8 ratio earlier and more severely than females. We argue that age-by-sex stratification should guide vaccination and geroprotective strategies in an aging population.