Śrīmad-Bhāgavatam · Text 3.11.33
Who is speaking and story frame
एवंविधैरहोरात्रै: कालगत्योपलक्षितै: ।
अपक्षितमिवास्यापि परमायुर्वय: शतम् ॥ ३३ ॥
evaṁ-vidhair aho-rātraiḥ
kāla-gatyopalakṣitaiḥ
apakṣitam ivāsyāpi
paramāyur vayaḥ-śatam
Thus the process of the exhaustion of the duration of life exists for every one of the living beings, including Lord Brahmā. One’s life endures for only one hundred years, in terms of the times in the different planets.
Read Śrīla Prabhupāda's purport on Vedabase.io