OXTR and Mental deterioration: As cognitive decline is a cardinal symptom of old age and given the pivotal role of OTR and MOPr in cognition (Jafari‐Sabet & Jannat‐Dastjerdi, 2009), we assessed the impact of aging on MOPr and OTR binding in the CA2/CA3 hippocampal region, which serves a critical function in memory.