Bottom line: Aging can alter adrenal steroid output and hypothalamic-pituitary-adrenal (HPA) signaling, but there is no universal “adrenal age.” A lower DHEAS value is not, by itself, adrenal failure or accelerated aging; a single cortisol value is especially difficult to interpret without its timing and clinical purpose. Hormone…
Evidence verdict: Sarcopenia is an age-associated muscle disorder linked to falls, disability and mortality. Consensus frameworks prioritize low muscle strength, with low muscle quantity or quality used to confirm diagnosis and poor performance indicating greater severity. Human evidence supports resistance-centered exercise, often combined with appropriate nutrition, as the…
Evidence verdict: Human aging is heterogeneous across organ systems. Large 2025 proteomic and MRI studies support measurable organ-specific age gaps for the brain, cardiovascular system, liver, kidneys and other tissues, and accelerated organ age can predict corresponding disease risk. These clocks are promising research tools, but they are…
Evidence verdict: Brain aging reflects interacting vascular, metabolic, immune, synaptic and proteostatic changes rather than one clock-like process. MRI-derived brain-age gaps can predict later cognitive decline in longitudinal cohorts, and 2025–2026 studies have strengthened links to genetics and future impairment. Brain-age estimates remain model-dependent research biomarkers, not standalone…