biological clock

Translations
биологические часы
Her biological clock is ticking, and she feels the pressure to start a family.
Её биологические часы тикают, и она чувствует давление, чтобы завести семью.
Definitions
A biological clock refers to the internal mechanism in living organisms that regulates various physiological processes, including sleep-wake cycles, hormone release, and other bodily functions, in accordance with the time of day or seasonal changes.
Words
biological

adjective
биологический
clock

noun
часы