It is narrated from Sayyiduna Mu'adh bin Anas al-Juhani (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever treats his parents with kindness, glad tidings are for him; Allah Almighty increases his life span."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17581