Is the title of a US President permanent? [duplicate]
Ultimately I'm wondering whether the descriptive in "former President [Name]" is superfluous or necessary in everyday usage, such as when talking to an audience who knows who the current president is.
The tradition and custom of the US military forces and diplomatic corps is to address the person as "Mr. President" after he leaves office, for the rest of his life. It is not his legal title, it is an honorific.