age-old

adj

age-old

adj

1

Very old; having existed for a long time; ancient or well-established.

They still make pottery by hand, in the age-old tradition.
It is a striking fact that it seems to be an age-old tradition amongst locomotive designers that a 0-6-0 tender engine must have inside cylinders.1945 November and December, H. C. Casserley, “Random Reflections on British Locomotive Types—1”, in Railway Magazine, pages 319–320:

1 more example

And on a programme of works of this magnitude, passengers will need to be mindful of the age-old maxim of 'no gain without pain'.2020 September 23, Paul Stephen, “East Coast upgrade: changes to schedule... but on schedule”, in Rail, page 31:

Synonyms: antediluvian, old as the hills, old as Adam

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.