Some old politicians who have probably been overlooked -
R. Sargent Shriver - VP Candidate in '72 - 90, has alzheimers or however you spell it
Earl Butz - 96, secretary of Agriculture in the 70s
Claiborne Pell - 88(?), Popular US Senator from Maryland, has parkinsons.
E. Gough Whitlam, Australian PM, 89 and said to be in " declining health"
Anthony Mamo - 96, Former Malta President
Alfonso López Michelsen - 92, Former Colombia President
Robet Byrd - 88, US Senator West Virginia, he is still a Senator and up for reelection this year, how long can he last?
Lesser knowns -
Arthur Link - 91, Governor of North Dakota in the 70s
Cliff Hansen - 93, US Senator Wyoming
Albert Roselini - 95, Governor of Washington
George Smathers - 92, US Senator Florida
Bill Avery - 94, Governor of Kansas
I know, most of these arent famous enough, but it may be something to look into.