Atlantic water masses are particularly interesting, not only regionally, but also for the global ocean, due to the vital status of the Atlantic Meridional Overturning Circulation in the global climate. This study presents quantitative assessments of water mass age characteristics and ventilation time scales through an analysis using the transient tracers chlorofluorocarbon‑12 (CFC‑12), sulfur hexafluoride (SF6), and argon‑39 (39Ar). The age analysis reveals significant basin‑scale asymmetries, with western basins exhibiting younger ages compared to eastern counterparts. This integrated age framework provides novel insights into water mass ventilation dynamics and their biogeochemical implications through quantitative characterization of temporal‑spatial age distributions across different oceanographic provinces.