an egg's age en · NOUN
Meanings
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(US, dated, slang) A very long time.
Nothing about my natural charms no more, an egg's age since anybody had called me to 1 side and whispered "I got a T. L. for you. Gertie thinks your ears is immense."
1922, Thomas Lansing Masson, Our American Humorists, page 201:As entertaining a book as you will find in an egg's age.
1928, New York Herald Tribune Books, volume 4, numbers 1-11, page 21: