What is the age of Krishna during Mahabharata War?

The Mahabharata war, also called the Kurukshetra war, is the climactic event of the Hindu epic, Mahabharata. It is fought between two sets of cousins in the Kuru dynasty, the Pandavas (sons of Pandu) and the Kauravas (sons of Dhritarashtra).

Kingdoms like Panchala and Matsya side with the Pandavas. Krishna, the regent of Dwaraka, drives the chariot of Arjuna, the third Pandava, and signals his support for their cause.

The war is fought over eighteen days on the battlefield of Kurukshetra. ...