While reading the Atharva Veda I came across this interesting hymn to Indra that mentions:
He who discovered in the fortieth autumn Sambara dwelling in the midst of mountains: Who slew the Dragon putting forth his vigour, the demon lying there, He, men, is Indra.
I want to understand what the number forty refers to here. Is it the age of Indra at the time of the encounter with the dragon? DO any scriptures mention the age of Indra at the time of this encounter?