Purañjana is embraced by old age (Srimad Bhagavatam #71)

After being attacked by the forces of Caṇḍavega for many years, the defenses of the city of Purañjana are already worn out. This illustrates the period preceding old age, where one sees a great diminution of energy, and the body starts to give trouble. This is the age the scriptures recommend one retire from active family life and focus on one's self-realization. Purañjana, however, preferred to ignore the warnings, and now Kālakanyā, followed by Prajvāra and Yavana-rāja, will deliver the final blow.