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Śrimad-Bhāgavatam
[Canto 9, Ch. 1
tasya —of Sudyumna;  utkalaḥ —by the name Utkala;  gayaḥ —by the name Gaya;  rājan —O King Parīkṣit;  vimalaḥ ca —and Vimala;  trayaḥ —three;  sutāḥ —sons;  dakṣiṇā-patha —of the southern part of the world;  rājānaḥ —kings;  babhūvuḥ —they became;  dharma-vatsalāḥ —very religious.
TRANSLATION
O King, Sudyumna had three very pious sons, named Utkala, Gaya and Vimala, who became the kings of the Dakṣiṇā-patha.
TEXT 42
ततः परिणते काले प्रतिष्ठानपतिः प्रभुः । पुरूरवस उत्सृज्य गां पुत्राय गतो वनम् ॥४२॥
tataḥ pariṇate kāle   pratiṣṭhāna-patiḥ prabhuḥ   purūravasa utsṛjya   gām putrāya gato vanam
tataḥ —thereafter;  pariṇate kāle —when the time was ripe;  pratiṣṭhāna-patiḥ —the master of the kingdom;  prabhuḥ —very powerful;  purūravase —unto Purūravā;  utsṛjya —delivering;  gām —the world;  putrāya —unto his son;  gataḥ —departed;  vanam —to the forest.
TRANSLATION
Thereafter, when the time was ripe, when Sudyumna, the king of the world, was sufficiently old, he delivered the entire kingdom to his son Purūravā and entered the forest.
PURPORT
According to the Vedic system, one within the institution of  vaṇa  and  āśrama  must leave his family life after he reaches fifty years of age ( pañcāśad ūrdhvaṁ vanaṁ vrajet ). Thus Sudyumna followed the