Des siècles que je vous ai vu.

Never heard “donkey’s years” before. Better would be "I haven’t seen you in ages.

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“Donkey’s years” is common enough where I live (Australia).

English Translation

I haven’t seen you in donkey’s years!

Why not stick to the direct translation (centuries) ?

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English Translation

I haven’t seen you in donkey’s years!

Plain daft to use an idiom in the English translation. No one in France itself has heard of “donkey’s years”.

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