Adjective
old as the hills (not comparable)
(idiomatic, simile, chiefly hyperbolic) Extremely old.
Synonyms: aged, age-old, ancient, old as the Pyramids, old as time, older than dirt, older than the Pyramids; see also Thesaurus:old
The desire to write perfectly of beautiful happenings is, as the saying runs, old as the hills - and as immortal. James Branch Cabell
As old as the hills. Walter Scott
Money does not pay for anything, never has, never will. It is an economic axiom as old as the hills that goods and services can be paid for only with goods and services. Albert Jay Nock
I have nothing new to teach the world. Truth and Non-violence are as old as the hills. All I have done is to try experiments in both on as vast a scale as I could. Mahatma Gandhi
Yeah, I'm old as the hills and you would think I'd be out to pasture someplace because I've done everything, but nothing has changed. Barry Manilow
However, Dudeney states that the problem is "as old as the hills. Source: Internet