You accumulate doctors.

When I was 20, I had two doctors, my GP and my OD.
When I was 40, it was the GP, the OD, the orthopedic surgeon, and the urologist.
Now that I'm 60, I have a GP, an MDO, same orthopod, same urologist, a nephrologist, a neurosurgeon, and a pain management MD.

My dad's 85 and has a cardiologist on top of those.

My cellphone has an app for ICE (In Case of Emergency) with all my emergency contacts. I also carry a current copy of all my prescriptions on a written list in my wallet.