CC Ādi 13.18

bālya, paugaṇḍa, kaiśora, yauvana, — cāri bheda
ataeva ādi-khaṇḍe līlā cāri bheda
Synonyms: 
bālya — childhood; paugaṇḍa — early boyhood; kaiśora — later boyhood; yauvana — youth; cāri — four; bheda — divisions; ataeva — therefore; ādi-khaṇḍe — in the original part; līlā — of the pastimes; cāri — four; bheda — divisions.
Translation: 
In His original pastimes there are four divisions: bālya, paugaṇḍa, kaiśora and yauvana [childhood, early boyhood, later boyhood and youth ].