प्रतिपन्नं कलियुगमिति प्राहु: पुराविद: ॥ ३३ ॥
tasminn eva tadāhani
iti prāhuḥ purā-vidaḥ
Those who scientifically understand the past declare that on the very day that Lord Śrī Kṛṣṇa departed for the spiritual world, the influence of the Age of Kali began.
Although technically Kali-yuga was to begin during the time of Lord Kṛṣṇa’s presence on earth, this fallen age had to wait meekly for the departure of the Supreme Personality of Godhead.