The circulating senosome: Blood as the therapeutic interface of aging

Aging is commonly framed as a progressive accumulation of cellular and tissue-level damage. However, the aged organism does not decline as a collection of isolated organs. Aging is communicated systemically through blood-borne signals that connect senescent cells, immune remodeling, vascular dysfunction, metabolic stress, dysbiosis, and chronic inflammation. I propose the concept of the circulating senosome to describe the composite network of age-associated circulating mediators, including senescence-associated secretory phenotype proteins, extracellular vesicles, inflammatory cytokines, lipids, metabolites, complement and coagulation mediators, autoantibodies, cell-free nucleic acids, and microbiome-derived products. This framework positions blood as both a biomarker compartment and a therapeutic interface in aging biology. The circulating senosome does not replace established hallmarks of aging; rather, it provides a systemic layer through which multiple hallmarks interact. Defining, measuring, and therapeutically remodeling this circulating network may create new opportunities for translational geroscience.