Namaste all.

I can recall reading somewhere that when all the devas had gathered together to bless Hanumanji after Indra had struck him with the vajra, Mahakala blessed Hanuman so that time would never affect the appearance of his body and he would be forever youthful. Is this from Valmiki Ramayana or a different version of the tale, and if so which version?

Thanks in advance for any answers.

Aum Namah Shivaya.