[QUOTE=I Love Me, Vol. I]
Former presidents are also just ‘presidents’, even if they are not THE president. And they are ‘President’ if you are using it as a title and/or to precede their name. A teacher would say: “name all the presidents, Suzy.” Rather than, “name all the former presidents and the current one, Suzy.”
I could be sooooooooo wrong about this, but it feels right to me.
[/QUOTE]
It seems good enough for casual settings, but I think the OP was more concerned with hyper-formal settings, like when the first couple is being announced by the Royal Crier to the Queen of England and Parliament, or some similar event.