“Despite the fact Lord Krishna grows from childhood to boyhood and from boyhood to youth, astonishingly enough He never ages beyond youth. At the time of the Battle of Kurukshetra, He had many grandchildren at home; or, in other words, He had sufficiently aged by material calculations. Still He looked just like a young man twenty or twenty-five years old.” (Shrila Prabhupada, Bhagavad-gita, 4.6 Purport)