The advanced practice registered nurse (APRN) assesses a 75 year-old patient in the primary care office. The patient presents with concerns of bilateral tender, stiff wrists associated with metacarpophalangeal (MCP) and distal interphalangeal (DIP) joint pain. They report associated stiffness that is worse in the morning for about an hour or more and after periods of Inactivity. On physical exam the APRN notes tender, warm, non-erythematous joints. What is the most likely cause of the patient's joint pain?