Auld folk are twice bairns.
Auld moon mist ne'er died o' thrist.
"Foggy weather in the last quarter of the moon is supposed to betoken moisture."—Robert Chambers.
Auld sins breed new sairs.
Auld sparrows are ill to tame.
Auld springs gie nae price.
Things out of fashion are valueless.
Auld stots hae stiff horns.
Auld use and wont hings about the fire.
Old manners and customs are difficult to be got rid of.