Which President in the below list has the biggest age difference with his first lady

Which President in the below list has the biggest age difference with his first lady ? (This list includes only those presidents or leaders with official spouses)

Q2: https://plus.google.com/111375717217714398633/posts/PbMPhKj3ZCk

Q3: https://plus.google.com/111375717217714398633/posts/a36Xeim4Dws

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