age-old

Very old or established; related to a time long before one would be able to remember. Why don't we ever sing new songs? I'm sick of these age-old hymns. My writing professor is always reminding us of the age-old axiom "show, don't tell" so that our stories are interesting and entertaining to the reader. The offering of the first harvest to the gods is an age-old tradition in this village.

See also:

be (as) old as the hills
(as) old as dirt
(as) old as the hills
old as the hills
old as the hills, (as)
be (as) old as dirt
make old bones
at a/the ripe old age
at/to a ripe old age
as old as Adam

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