"Senior Citizen" (1917 and 1929 isolated uses)

[bapopik at AOL.COM]

http://www.barrypopik.com/article/919/senior-citizen
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If I run for anything, I might have to approach seniors. What have I done for seniors? Well, I can tell them about the origin of "senior citizen"!
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On a re-check, two earlier cites and some bad Newspaperarchive "hits" appear. It still looks like a California term from 1937 and 1938.