Answer:
40.
Explanation:
Historians agree that the Holy Quran was revealed on Monday. However, there is disagreement about the month the Quran was revealed. Hafidh Ibn Abdul Baar rah. stated, the Quran was revealed to Prophet Muhammad (peace be upon him) on the 8th of Rabi'ul Awwal.
So, Prophet Muhammad (peace and blessings of Allah be upon him) was 40 at the time of the revelation of the Quran.
I hope this helps! :)
