Mukhtasar Bukhari (Abridged) 183 — Giving miswak to an elder is Sunnah

Narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet Muhammad (peace and blessings be upon him) said: "I saw myself in a dream cleaning my teeth with a miswak. Then two persons came to me, one of whom was older than the other. I gave the miswak to the younger of them, but I was told, 'Give it to the older one.' So I gave the miswak to the older of them."