Researchers mapped how lifetime environmental exposures—from air pollution to social isolation—accelerate frailty through eight distinct biological pathways including chronic inflammation, mitochondrial dysfunction, and epigenetic aging. The exposome framework reveals that socioeconomic disadvantage, ultra-processed foods, sedentary behavior, and climate stressors systematically increase vulnerability, while Mediterranean-style diets, green spaces, and social connection provide protection. This represents a paradigm shift from viewing frailty as inevitable aging to recognizing it as largely preventable through environmental modification. The findings validate what longevity researchers have long suspected: that biological aging reflects cumulative environmental damage more than genetic destiny. For clinical practice, this suggests screening for actionable environmental risks—pollution exposure, social isolation, diet quality—could be as important as traditional medical assessments. The mechanistic pathways identified, particularly mitochondrial dysfunction and gut dysbiosis, align with emerging anti-aging interventions targeting these same systems. However, the observational nature of much supporting evidence means causality remains uncertain, and individual responses to environmental modifications will likely vary significantly based on genetic background and exposure timing.