The Messenger of Allah (may Allah's peace and blessings be upon him) was given something to drink, so he drank from it, and there was a boy on his right

In this Hadīth, the Prophet (may Allah's peace and blessings be upon him) sought the young boy’s permission to give the drink to the old men first. He did that to comfort the hearts of the old men, and to let them know that they are loved and cared for, and as a token of respect for them, so long as the Sunnah does not prevent doing so. The Sunnah in this situation is that the person sitting on the right is worthier (of giving first), and that no one should be given before him except with his permission. Also, there is nothing wrong in seeking permission from the person on the right, while he is not obliged to give permission, and that he should not give permission if it entails missing a religious virtue and a worldly benefit. The boy in the Hadīth was Ibn ‘Abbās.