Purāṇa-puruṣa means the oldest living entity, but still, He's nava-yauvana, young. Just like Kṛṣṇa. You have seen the picture of Kṛṣṇa. You'll find Him always a young boy, from sixteen to twenty years old. You have seen the picture of Kṛṣṇa in the Bhagavad-gītā. We have got the picture, Arjuna. Kṛṣṇa had at that time great-grandsons, but you see His picture just like a boy, young boy, very nice.
So the spirit is never old. Never old. Always young. You'll find, those who are studying the Vedic literatures, that in the Vaikuṇṭhalokas the inhabitants are always young, exactly like God. God is always young, fifteen to twenty years old, just like boy. So Ṛṣabhadeva says that, "You are wanting happiness . . ." And happiness . . . death does not mean happiness, disease does not mean happiness, birth does not mean happiness, old age does not mean happiness. So when you are happy? If you are subjected to birth, death, old age and disease, then where is your happiness?
That is called illusion, māyā. Actual happiness is not there. Therefore Vedic literature informs: ramante yoginaḥ anante (CC Madhya 9.29). The yogīs, they enjoy happiness unlimitedly. There is no end. Here in this material world you may enjoy anything, but it will have its end after a few minutes. That's all. You cannot enjoy perpetually. That is not possible. Therefore . . . but we are hankering after perpetual happiness, continued happiness. So Ṛṣabhadeva advised, "My dear boys, you take to austerity." Tapo divyaṁ yena śuddhyet sattvam (SB 5.5.1). "After you are purified, then brahma-saukhyam anantam, then you get unlimited happiness."
So this Kṛṣṇa consciousness movement is trying to give the whole human society the direction how he can enjoy unlimitedly. Yena śuddhyet sattvam. Ramante yoginaḥ anante. Really, those who are yogīs, they enjoy. These Kṛṣṇa conscious persons, people, they are also yogīs, bhakti-yogīs. They are the best of the yogīs. As we see in the Bhagavad-gītā, in the chapter in which sāṅkhya-yoga has been explained, the conclusion is, yoginām api sarveṣām (BG 6.47): "Of all the yogīs . . ." yoginām api sarveṣāṁ mad-gatenāntar-ātmanā, "one who is thinking within himself about Me, Kṛṣṇa," mad-gaten . . . śraddhāvān, "with faith and love," bhajate mām, "engaged in My devotional service," sa me yuktatamo mataḥ, "he is the first-class yogī." He is the first-class yogī.
So we are preaching in this Kṛṣṇa consciousness movement, "Everyone should become a first-class yogī. And when one becomes a first-class yogī, perfect yogī, then ramante yoginaḥ anante, then they enjoy eternal, blissful life of knowledge. Ramante yoginaḥ satyānande, that is real happiness, satyānande. In this material world it is mithyānande. Therefore Śaṅkarācārya says, brahma satyaṁ jagan mithyā. Jagan mithyā. The material world, wherein you are trying to find out happiness, that is false, illusion. If you want real happiness, that is in the spiritual world.