Śrīmad-Bhāgavatam 3.11.34
SB 3.11.34
Open the full passageSanskrit
yad ardham āyuṣas tasya parārdham abhidhīyate pūrvaḥ parārdho 'pakrānto hy aparo 'dya pravartate
Translation
The one hundred years of Brahmā's life are divided into two parts, the first half and the second half. The first half of the duration of Brahmā's life is already over, and the second half is now current.