Analysis of 25 rodent longevity models reveals that enhanced blood flow and angiogenesis drive healthful aging in only seven cases, with brown adipose tissue (BAT) emerging as a surprising mediator. Regulator of G Protein Signaling 14 knockout mice demonstrated that BAT removal eliminated longevity benefits, while BAT transplantation into normal mice enhanced both angiogenesis and blood flow. This mechanistic insight shifts focus from purely cellular aging theories to vascular health as a longevity determinant. The finding carries significant translational potential since humans possess functional brown fat, unlike many other longevity mechanisms discovered in rodents. However, the review exposes a critical research gap: most longevity studies ignore vascular parameters entirely. This oversight may explain why interventions showing promise in animal models often fail in human trials. The BAT-angiogenesis axis represents a potentially druggable pathway for extending healthspan, particularly relevant given that cardiovascular decline remains a primary driver of aging-related morbidity. The mechanistic specificity—requiring intact BAT for vascular benefits—suggests targeted therapeutic approaches rather than broad interventions may prove most effective for translating longevity research into clinical applications.