Exercise activates SIRT1 deacetylase across multiple organ systems including adipose tissue, hippocampus, heart, liver, bone, and skeletal muscle in both aged animals and older adults. Different training protocols—aerobic, resistance, and combined—increase SIRT1 mRNA, activity, and protein levels, positioning this enzyme as a potential exerkine that mediates exercise's anti-aging benefits systemically rather than just locally. The mechanistic breadth is striking: SIRT1 simultaneously regulates mitochondrial dynamics, metabolic pathways, tissue remodeling, autophagy, inflammatory responses, and redox balance. This positions SIRT1 as a master orchestrator of cellular maintenance rather than simply a histone deacetylase. The exerkine concept represents a paradigm shift in exercise physiology—suggesting that exercise benefits propagate through circulating factors that coordinate anti-aging responses across distant tissues. However, this review synthesis doesn't establish causality between SIRT1 elevation and improved healthspan outcomes. The field needs controlled trials measuring both SIRT1 levels and functional aging biomarkers to validate whether SIRT1 is merely correlated with exercise benefits or truly mediates them. If confirmed, targeted SIRT1 activation could become a pharmaceutical strategy mimicking exercise's longevity effects.