Vascular aging is a central determinant of healthy life span, not only influencing the susceptibility to cardiovascular diseases but also shaping the risk of systemic decline across multiple organs. It is driven by a variety of age-related factors, including cellular senescence, chronic inflammation, loss of proteostasis, mitochondrial dysfunction, genomic instability, epigenetic remodeling, and stem cell exhaustion. These processes interact with the unique mechanical and metabolic environment of the vasculature to create a distinctive pathological trajectory, manifested in part as arterial stiffening, impaired barrier integrity, and dysregulated vasomotor control. Recent advances in single-cell omics and cross-organ molecular clocks have revealed the heterogeneity and organ specificity of aging, underscoring the need for integrative frameworks that connect vascular biology with overall health. Meanwhile, the development of diverse therapeutic strategies-ranging from senolytic and immune-mediated clearance to metabolic and mitochondrial interventions-highlights the translational potential of targeting the aging vasculature. Looking ahead, multimodal biomarkers and precision medicine may transform vascular aging from an inevitable process into a modifiable determinant of health span.