the old
Examples
In the old days, people knew a little and understood a lot. Then they gained more knowledge which led to less understanding. And now people know a lot but understand nothing at all.
The old Romans all wished to have a king over them because they had not yet tasted the sweetness of freedom.
The old are in a second childhood.
Do not ask the old – ask the experienced.
Cats don't catch the old birds.
Draw water from the new well, but do not spit in the old one.