By my count, we now have four living ex-Presidents–Ford, Carter, Bush I, and Clinton. Before President Reagan’s demise today, we had five, and I believe that’s the most that we’ve ever had. It seems unlikely that we’d have ever had more than that in our nation’s history, given the lengths of terms and the ages at which presidents normally become president, but does anyone know for sure?

Of course, if one wanted to be macabre, one could start a pool on who will be the next to go, and if it will occur before the current president joins their ranks (which of course depends a lot on what happens in November…).