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"Age is an issue of mind over matter. If you don't mind, it doesn't matter."
The phrase "mind over matter" goes back at least to 1863 used by an English lawyer and geologist.
(The Geological Evidence of the Antiquity of Man by Sir Charles Lyell ) *
It could be possible that it was later paraprosdokianized by ? Oscar Wilde ?
Kit Barry
The Ephemera Archive for American Studies
* Wikipedia