The wise Elder, Sahasrahla, is at the eastern end of Hyrule, in Sahasrahla's Hideout in the Eastern Ruins. The Cucco Pen Kid marked the location with a white X on your in-game map early in your quest.

To find Sahasrahla's Cottage, head to Kakariko Village in the west of Hyrule. Look for the red "X" on your in-game map. Use the Sanctuary starting location if you're starting a new session and ...