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Cho sean ri ceò nam beann

As old as the hills

And when you reach ceud bliadhna a dh’aois (a hundred years of age), it could be said of you (but not to you—that would be far too rude!) that you are cho sean ri ceò nam beann (as old as the hills)! This literally means as old as the mist of the hills. 

In some places you may also hear cho aosta ri(s) na bruthaichean, which means the same thing.