This human form of life, as Prahlāda Mahārāja says, durlabhaṁ mānuṣaṁ janma. Durlabhaṁ mānuṣaṁ janma tad apy adhruvam arthadam (SB 7.6.1). This human form of life is obtained after many, many millions and millions of births, evolutionary process. We have already discussed this point. So that is the Vedic civilization, that a human being should be given chance to understand this bhāgavata-dharma, Kṛṣṇa consciousness. Kṛṣṇa consciousness means bhāgavata-dharma.
So Prahlāda Mahārāja recommends, kaumāram ācaret prājño dharmān bhāgavatān iha: from the childhood. It is not that it is reserved for our old-age occupation. Sometimes we think like that, that "At the present moment we are young. Let us enjoy life. And at the old age, when you are old enough, preparing for death, at that time we may try to understand what is Kṛṣṇa consciousness, or bhāgavata-dharma." But Prahlāda Mahārāja says no. The children should be taught from the age, as we send our children to school in minor age, similarly we should send our children to understand this bhāgavata-dharma.