Sayyiduna Abdullah bin Umar narrates: A very old man came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah! Teach me a deed by which I may draw near to Allah Almighty, my Lord." The Prophet (peace and blessings be upon him) said: "Hold fast to striving (jihad) in the path of Allah Almighty." He said: "I am not able to do that; I am advanced in age and I am weak." The Prophet (peace and blessings be upon him) said: "Then become a mu'adhdhin!"
Al-Tabarani recorded it in al-Awsat; its chain contains a narrator, Qurayb, the father of al-Asma'i, and he is munkar al-hadith (his hadith are rejected).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 1843