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Pancreatic cancers, whose incidence increases with age, are often refractory to treatment. Here, we identified a core mechanism shared by physiological homeostasis, senescent cell accumulation during aging, and pancreatic cancers. Pancreatic acinar cells, when stressed, secrete CXCL13, which protects stressed cells while transiently activating paracrine Hippo/YAP signaling to induce proliferation and PD-L1-mediated immune protection to maintain organ homeostasis. In the aged pancreas, CXCL13/YAP/PD-L1 signaling permits senescent cells to survive, driving feedforward chronic inflammation and steatosis. Because of prolonged CXCL13/YAP/PD-L1 activation in pancreatic cancers, neighboring noncancerous cells, activated for proliferation and immune-protected, eventually transform and accelerate tumor progression. CXCL13 blockade removed senescent cells and ameliorated steatosis in the aged pancreas while suppressing tumor growth in pancreatic cancer models, highlighting the CXCL13/YAP/PD-L1 axis as a potential therapeutic target. Together, our findings demonstrate the stress-induced CXCL13/YAP/PD-L1 axis as a central regulator of cell-state transitions in the pancreas, providing a unifying principle by which organ homeostasis, aging, and tumorigenesis are governed.