We found one dictionary that defines the word crow's age:

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1. crow's age: Wiktionary

Definitions from Wiktionary (crow's age) ▸ noun:  (colloquial) A very long time. ▸ Words similar to crow's age ▸ Usage examples for crow's age ▸ Idioms related to crow's age ▸ Wikipedia articles (New!) ▸ Words that often appear near crow's age ▸ Rhymes of crow's age ▸ Invented words related to crow's age