Anyone remember FDR?

If you're over a "certain age" you have at least a vague idea of who FDR was.  When he died he'd been president for 12 years.

An old, respected president.  A savvy, energetic leader, now understandably tired, in old age but unable to retire due to leading the nation through WW2, finally cut down by a stroke.

Any idea how old FDR was when he died?  Take a guess, then highlight the line below to show the answer. 

   FDR died at 63.

When the frail FDR died of a stroke he was 18 years younger than Porridgebrain.