Explain the pun old skiers never die they just go downhill

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Explain the pun old skiers never die they just go downhill

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“Veterans do not die – they do not become obsolete” was a saying of General Douglas MacArthur (1880-1964) as he said goodbye to Congress on April 19, 1951. There are many parodies of the saying done.
“Old skiers never die – they never go downhill” is a single line that says printed on many posters and T-shirts. The line has been mentioned since at least 1973; in 1975, the saying on bumper sticker was advertised in Ski magazine.