My mom was a RN (Registered Nurse) for 30+ years. She quit doing what most people think of as "being a nurse" about 10-15 years ago and switched to related work (home checkups, teaching, medical billing, etc.) because of how stressful and demanding working the floor in a hospital was.
Last year she retired from the profession entirely, a few years ahead of "normal retirement age", and now she works part-time at a local farm/fruit stand. The main things that drove her to retire early was management insisting on 12 hour shifts and not hiring enough staff.