Cross-species research demonstrates that taurine supplementation significantly extends both lifespan and healthspan across multiple organisms, from mice to monkeys. The amino acid, which naturally declines with age in humans by up to 80% between youth and old age, appears to counteract fundamental aging processes through multiple mechanisms including cellular senescence reduction and metabolic optimization. This represents one of the most comprehensive longevity interventions tested across diverse species, suggesting evolutionary conservation of taurine's anti-aging effects. The practical implications for human longevity are substantial, as taurine is already available as a supplement and naturally present in foods like fish and meat. However, the optimal dosing for humans remains unclear, and the translation from animal models to human outcomes requires careful consideration. While previous research has linked taurine to cardiovascular and neurological benefits, this multi-species validation elevates it from a niche supplement to a potentially foundational longevity compound. The convergent evidence across phylogenetically distant species strengthens the biological plausibility that taurine could meaningfully extend human healthspan, though clinical trials in humans will be essential for definitive recommendations.