Shrimad Bhagavatam (10.55.28) describes how the Dvaraka queens of Krishna became bashful, and hid themselves here and there upon seeing the teenage Pradyumna (Krishna’s son) whom they mistook to be their husband Shri Krishna.
Shri Jiva Goswami said, “Shri Krishna does not age beyond the kaishora period (ages 10-16).” (tika: SB 10.45.3) To be exact, the 19th century Gaudiya Vaisnava acharya Siddha Krishnadasa Tatapada said, “Bhagavan Shri Krishna’s eternal age is 15 years, 9 months, seven and a half days!”
In an amazing Bhagavata tika (SB 10.45.3), Gaudiya Vaisnava Mahajana, Shri Jiva Goswami reveals the exact age of Shri Krishna during some of His spectacular pastimes. To please the ears and hearts of our devoted friends, we summarize here:
Ashvina Month (Sept-Oct); Shri Krishna played flute.
Karttika Month (Oct-Nov); Shri Krishna lifted Mount Govardhana (although Vrajavasis there exclaimed that Krishna was only seven years old).
Karttika sukla ekadashi: Indra and Surabhi bathed Shri Krishna and gave name “Govinda”.
Karttika sukla dvadashi: Shri Krishna went to Varuna’s kingdom to rescue Nanda Baba.
Karttika Purnima: Shri Krishna immersed His Vrajavasis devotees in the lake Brahma-hrada to show them the spiritual realm and Krishnaloka.
Karttika Mrgashirsha month: During the winter season, Shri Krishna stole the Vraja kanyas clothing.
Next summer: In the summer of his eighth year, Shri Krishna gave mercy to the Yajna patnis, wives of the brahmanas.
Ashvina month (autumn, sharada season) In his ninth year, Shri Krishna enjoyed the rasa dance.
Phalguna month: (Krishna caturdashi, Shiva Ratri) Krishna rescued Nanda Baba from the Vidhyadhara serpent in Ambikä-vana.
Phalguna Holi Purnima: Krishna kills Shankhacuda.
Caitra Month: (march-april) On Purnima, Krishna killed Aristasura [and also manifested Radha-kunda] [Krishna’s “running age” although was still age 10]
AGE 12: Shri Krishna killed Keshi, the last demon killed in Vraja, on Phalguna sukla dwadasi. On Trayodashi, uncle Akrura took Krishnaji to Mathura. The next day on Phalguna chaturdashi, Shri Krishna killed Kamsa. Once Krishna enters His kaishora period, He does not age beyond that.
Nitya nava-yauvanam, saundarya swarupam Bhagavan Shri Krishna ki jai! Jaya Jaya Shri Radhe!