The comparison made here is very interesting. Kṛṣṇa does not grow like an ordinary human being, even though He exhibits His pastimes of childhood, boyhood and pre-youth. When He reaches the age of pre-youth, kaiśora, He does not grow any older. He simply remains in His kaiśora age. He is therefore described in the Brahma-saṁhitā (5.33) as nava-yauvana: advaitam acyutam anādim ananta-rūpam ādyaṁ purāṇa-puruṣaṁ nava-yauvanaṁ cavedeṣu durlabham adurlabham ātma-bhaktau govindam ādi-puruṣaṁ tam ahaṁ bhajāmi This nava-yauvana, or pre-youth, is the eternal transcendental form of Kṛṣṇa. Kṛṣṇa never grows older than nava-yauvana.