- superlative form of : most auld
1895, D. M. Moir, The Life of Mansie Wauch:
- And, in the third place (for I'll speak the truth and shame the deil) as I could not thole the gibes and idle tongues of a wheen fools that, for their diversion, would be asking me, "How the wife and bairns were; and if I had sent my auldest laddie to the school yet?"
1868, Alexander Hislop, The Proverbs of Scotland:
- Greed is envy's auldest brither: scraggy wark they mak thegither.