As far as Kṛṣṇa's transcendental qualities are concerned, they can be divided into three groups: qualities pertaining to His transcendental body, qualities pertaining to His transcendental speech and qualities pertaining to His transcendental mind.
Kṛṣṇa's age, His transcendental bodily features, His beauty and His mildness are qualities pertaining to His body. There is no difference between Kṛṣṇa and His body, and therefore the transcendental features pertaining to His body are the same as Kṛṣṇa Himself. But because these qualities stimulate the devotee's ecstatic love, they have been analyzed as separate causes of that love. To be attracted by the qualities of Kṛṣṇa means to be attracted by Kṛṣṇa Himself, because there is no real distinction between Kṛṣṇa and His qualities. Kṛṣṇa's name is also Kṛṣṇa. Kṛṣṇa's fame is also Kṛṣṇa. Kṛṣṇa's entourage is also Kṛṣṇa. Kṛṣṇa and everything related with Kṛṣṇa which gives stimulation to love of Kṛṣṇa are all Kṛṣṇa, but for our understanding these items may be considered separately.
Kṛṣṇa is the reservoir of all transcendental pleasure. Therefore, the impetuses to love of Kṛṣṇa, although seemingly different, are not actually distinct from Kṛṣṇa Himself. In the technical Sanskrit terms, such qualities as Kṛṣṇa's name and fame are accepted both as reservoirs of and as stimulation for love of Kṛṣṇa.
Kṛṣṇa's age is considered in three periods: from His appearance day to the end of His fifth year is called kaumāra, from the beginning of the sixth year up to the end of the tenth year is called paugaṇḍa, and from the eleventh to the end of the fifteenth year is called kaiśora. After the beginning of the sixteenth year, Kṛṣṇa is called a yauvana, or a youth, and this continues with no change.
As far as Kṛṣṇa's transcendental pastimes are concerned, they are mostly executed during the kaumāra, paugaṇḍa and kaiśora periods. His affectionate pastimes with His parents are executed during His kaumāra age. His friendship with the cowherd boys is exhibited during the paugaṇḍa period. And His friendship with the gopīs is exhibited during the age of kaiśora. Kṛṣṇa's pastimes at Vṛndāvana are finished by the end of His fifteenth year, and then He is transferred to Mathurā and Dvārakā, where all other pastimes are performed.
Śrīla Rūpa Gosvāmī gives us a vivid description of Kṛṣṇa as the reservoir of all pleasure in his Bhakti-rasāmṛta-sindhu. Here are some parts of that description.
Kṛṣṇa's kaiśora age may be divided into three parts. In the beginning of His kaiśora age—that is, at the beginning of His eleventh year—the luster of His body becomes so bright that it becomes an impetus for ecstatic love. Similarly, there are reddish borders around His eyes, and a growth of soft hairs on His body. In describing this early stage of His kaiśora age, Kundalatā, one of the residents of Vṛndāvana, said to her friend, "My dear friend, I have just seen an extraordinary beauty appearing in the person of Kṛṣṇa. His blackish bodily hue appears just like the indranīla jewel. There are reddish signs on His eyes, and small soft hairs are coming out on His body. The appearance of these symptoms has made Him extraordinarily beautiful."
In this connection, in the Tenth Canto, Twenty-first Chapter, verse 5, of Śrīmad-Bhāgavatam, Śukadeva Gosvāmī tells King Parīkṣit, "My dear King, I shall try to describe how the minds of the gopīs became absorbed in thought of Kṛṣṇa. The gopīs would meditate on Kṛṣṇa's dressing Himself just like a dancing actor and entering the forest of Vṛndāvana, marking the ground with His footprints. They meditated on Kṛṣṇa's having a helmet with a peacock feather and wearing earrings on His ears and yellow-gold colored garments covered with jewels and pearls. They also meditated on Kṛṣṇa's blowing His flute and on all the cowherd boys' singing of the glories of the Lord." That is the description of the meditation which the gopīs used to perform.
Sometimes the gopīs would think about His soft nails, His moving eyebrows and His teeth, which were catechu-colored from chewing pan. One description was given by a gopī to her friend: "My dear friend, just see how the enemy of Agha has assumed such wonderful features! His brows are just like the brows of Cupid, and they are moving just as though they were dancing. The tips of His nails are so soft—it is as if they were dried bamboo leaves. His teeth are reddish, and so it appears that He has assumed a feature of anger. Under the circumstances, where is the chance for a young girl not to be attracted by such beautiful features and not to be afraid of becoming a victim to such beauty?"
Kṛṣṇa's attractive features are also described by Vṛndā, the gopī after whom Vṛndāvana was named. She told Kṛṣṇa, "My dear Mādhava, Your newly invented smile has so captivated the hearts of the gopīs that they are simply unable to express themselves! As such, they have become bewildered and will not talk with others. All of these gopīs have become so affected that it is as if they had offered three sprinkles of water upon their lives. In other words, they have given up all hope for their living condition." According to the Indian system, when a person is dead there is a sprinkling of water on the body. Thus, the statement of Vṛndā shows that the gopīs were so enchanted by the beauty of Kṛṣṇa that because they could not express their minds, they had decided to commit suicide.