Authentic Supplication Number 226.

Abi Hurayrata reported of the Prophet  that he said: “The young should petition Salam upon the old, the passing upon the sitting, and the few upon the many.”

Reporters.
‘Al-`Adawee said it was sound , and that it was reported by Al-Bukhari, on page 14 of volume 11 of Fath Al-Baree; ‘Abu Dawood, page 381 of volume 5; and At-Tirmithi, page 485 of volume 7. At-Tirmithi said it was comely-sound.