The Idiom Attic - a collection of hundreds of English idioms, each one explained.
The meaning of "donkeys years"
" Donkey's years "
Meaning:
1. Cockney rhyming slang for ears. 2. A very long time.
Example:
1. Prince Charles has a fine pair of donkeys. 2. This is the first school reunion we've had since 1982. I haven't seen some of these people in donkey's years.