One verse

Srimad Bhagavatam 3.11.33

3.11.33

एवंविधैरहोरात्रै: कालगत्योपलक्षितै: । अपक्षितमिवास्यापि परमायुर्वय: शतम् ॥ ३३ ॥

evam-vidhair aho-ratraih kala-gatyopalaksitaih apaksitam ivasyapi paramayur vayah-satam

evam
thus
vidhaih
by the process of
ahah
days
ratraih
by nights
kala-gatya
advancement of time
upalaksitaih
by such symptoms
apaksitam
declined
iva
just like
asya
his
api
although
parama-ayuh
duration of life
vayah
years
satam
one hundred.

Thus the process of the exhaustion of the duration of life exists for every one of the living beings, including Lord Brahma. One’s life endures for only one hundred years, in terms of the times in the different planes.