since Adam was a boy

For a very long time. An allusion to Adam, the first human created by God in the Bible. What does Grandma mean when she says she's been teaching third grade since Adam was a boy?

See also: Adam, boy, since

See also:

(as) old as Adam
as old as Adam
covenant of salt
be (as) poor as Job
(as) poor as Job
(as) poor as Job's turkey
be moonstruck
game is not worth the candle, the
Peck's bad boy
end game

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