Wiktionary
a. (context simile English) Extremely old. alt. (context simile English) Extremely old.
Usage examples of "old as the hills".
I'll never again feel as tall as the sky and as old as the hills and as strong as the sea.
Bilbo Baggins had made the words, to a tune that was as old as the hills, and taught it to Frodo as they walked in the lanes of the Water-valley and talked about Adventure.
Ill never again feel as tall as the sky and as old as the hills and as strong as the sea.
Taller than I, very slender, a boy's smooth face, holding eyes as old as the hills of High Hallack-that was the first Herrel.
I say isn't it thrilling to be hundreds of feet below the earth, down in a copper-mine as old as the hills!
The use of caves for smuggling, whether natural or hewn by hand, is as old as the hills.
The fragments are as old as the hills and overgrown with gray moss, as if they had been lying there for hundreds of years, as if the Great Riddle Gate had never existed.