ancient as the hills
(as) ancient as the hills
Very old. Oh, she's ancient as the hills, she can't hear us. Why don't we ever sing new songs? Those hymns are as ancient as the hills.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
ancient (or old) as the hills
of very long standing or very great age.Hills are used in the Bible as a metaphor for permanence.
Farlex Partner Idioms Dictionary © Farlex 2017