kiśora-śekhara - topmost of youth; dharmī - whose natural position; vrajendra-nandana - the son of Mahārāja Nanda; prakaṭa-līlā - manifested pastimes; karibāre - to perform; yabe - when; kare - makes; mana - mind.

“As the son of Mahārāja Nanda, Lord Kṛṣṇa is by nature the paragon of kiśora [youth]. He chooses to exhibit His pastimes at that age.