The killing of Aghāsura took place when Kṛṣṇa and all His boyfriends were under five years old. Children under five years old are called kaumāra, from five years up to the tenth year they are called paugaṇḍa, and from the tenth year up to the fifteenth year they are called kaiśora. After the fifteenth year, boys are called youths. For one year there was no discussion of the incident of the Aghāsura demon in the village of Vraja. But when the boys attained their sixth year, they informed their parents of the incident with great wonder.
For Śrī Kṛṣṇa, the Supreme Personality of Godhead, who is far greater than such demigods as Lord Brahmā, it is not at all difficult to award one the opportunity of merging with His eternal body. This He awarded to Aghāsura. Aghāsura was certainly the most sinful living entity, and it is not possible for the sinful to merge into the existence of the Absolute Truth. But in this particular case, because Kṛṣṇa entered into Aghāsura’s body, the demon became fully cleansed of all sinful reactions. Persons constantly thinking of the eternal form of the Lord in the shape of the Deity or in the shape of a mental form are awarded the transcendental benediction of entering into the kingdom of God and associating with the Supreme Personality of Godhead. So we can just imagine the elevated position of someone like Aghāsura, into whose body the Supreme Personality of Godhead, Kṛṣṇa, personally entered. Great sages, meditators and devotees constantly keep the form of the Lord within their hearts, or they see the Deity form of the Lord in the temples; in that way they become liberated from all material contamination and at the end of the body enter into the kingdom of God. This perfection is possible simply by keeping the form of the Lord within the mind. But in the case of Aghāsura, the Supreme Personality of Godhead personally entered. Aghāsura’s position was therefore greater than the ordinary devotee’s or the greatest yogī’s.
Mahārāja Parīkṣit, who was engaged in hearing the transcendental pastimes of Lord Kṛṣṇa (who saved the life of Mahārāja Parīkṣit while he was in the womb of his mother), became more and more interested to hear about Him. And thus he questioned the sage Śukadeva Gosvāmī, who was reciting Śrīmad-Bhāgavatam before the King.
King Parīkṣit was a bit astonished to understand that the killing of the Aghāsura demon was not discussed for one year, until after the boys attained the paugaṇḍa age. Mahārāja Parīkṣit was very inquisitive to learn about this, for he was sure that such an incident was due to the working of Kṛṣṇa’s different energies.
Generally, the kṣatriyas or the administrative class are always busy with their political affairs, and they have very little chance to hear about the transcendental pastimes of Lord Kṛṣṇa. But while Parīkṣit Mahārāja was hearing these transcendental pastimes, he considered himself to be very fortunate because not only was he hearing Kṛṣṇa’s pastimes but he was doing so from Śukadeva Gosvāmī, the greatest authority on Śrīmad-Bhāgavatam. Thus being requested by Mahārāja Parīkṣit, Śukadeva Gosvāmī continued to speak about the transcendental pastimes of Lord Kṛṣṇa in the matter of His form, qualities, fame and paraphernalia.