Nitāi: "Then he posted Vajra, the son of Aniruddha, grandson of Lord Kṛṣṇa, at Mathurā as the king of Śūrasena. Afterwards Mahārāja Yudhiṣṭhira performed a Prājāpatya sacrifice and placed in himself the fire for quitting household life." (SB 1.15.39)
Prabhupāda: So Mahārāja Yudhiṣṭhira first of all appointed his grandson, Parīkṣit Mahārāja, the emperor of the whole world. Then he distributed... (break) ...or only intimate families, because Kṛṣṇa's family, Yadu dynasty, and this Mahārāja Yudhiṣṭhira's family, Kuru dynasty, they were related in so many ways by marriage. Mahārāja Yudhiṣṭhira's mother, Kuntī, belonged to the Yadu dynasty—means Kṛṣṇa's aunt, Kṛṣṇa's father's sister. Similarly, Arjuna's wife Subhadrā..., here is Subhadrā, she became the wife of Arjuna, sister of Kṛṣṇa. So there were so many family relationships, Kṛṣṇa's family and the Kuru family. Kṛṣṇa was not present. Therefore Mahārāja Yudhiṣṭhira was taking care of the children, grandsons. As his grandson was posted as emperor, similarly, Kṛṣṇa's grandson was also situated as the king of Śūrasena, in which province the Mathurā is there: mathurāyām.
So you can read the purport.
Nitāi: "Mahārāja Yudhiṣṭhira, after placing Mahārāja Parīkṣit on the imperial throne of Hastināpura, and after posting Vajra, the grandson of Lord Kṛṣṇa, as the king of Mathurā, accepted the renounced order of life."
Prabhupāda: Yes. This was the system, that one must retire. Just like at the present moment, although people are asking the president that "You retire, you resign," he is not resigning, obstinate. Because he knows, "This is the first and last chance. I am not going to be elected again. So stick to the post and take as much money as possible." That's all. But formerly, they voluntarily retired, the kings. In India also, we have seen. So many big, big politicians, they could not give up their political job. Even Gandhi. I wrote a personal letter to Gandhi that "Mahatma Gandhi, you are recognized all over the world as a very pious man, and you are supposed to be very devotee of Bhagavad-gītā. Now you have got your independence. You fought for independence. Now you have got your independence. So I request you to take the teachings of Bhagavad-gītā to preach all over the world." That was my request. Because I was thinking of preaching this Bhagavad-gītā. So I thought that "Gandhi's position is better. If he takes up this job, preaching of Bhagavad-gītā, many people will give attention. Yad yad ācarati śreṣṭhaḥ (BG 3.21). He is a recognized good man, so people will follow." But he did not do so. He stuck up to the politics. And unless he was killed by another opponent party, he did not give it up. Similarly, I have seen other politicians also, Jawaharlal Nehru, Panth,(?) they would not give up. Panth(?) was so weak, I have seen. He could not stand even. He was doing like this, always. Still he would not give up. Similarly, Jawaharlal Nehru, he was paralyzed. Unless he was dead, he could not give up.
So this is not Vedic civilization. Vedic civilization is that at a certain age, you must retire. Never mind. The age is divided into four parts: brahmacārī, gṛhastha, vānaprastha, and sannyāsa. Brāhmaṇa, kṣatriya, vaiśya, śūdra. So Vedic civilization means varṇāśrama-dharma, accepting the institution of four varṇas and four āśramas. Social and spiritual order. For social order there must be brāhmaṇa, kṣatriya, vaiśya, śūdra, and for spiritual order, there must be brahmacārī, gṛhastha, vānaprastha, and sannyāsa. This is the system. So unless you accept this institution of varṇāśrama-dharma, you are not considered as civilized man, Ārya, Āryan.