"Stress is basically a biological clock," Singer told The Daily Beast.
Before the fertility revolution, it was the alarm on the biological clock that rang at about age 35.
She now made plans to marry and have a child just as her biological clock was ticking toward never.
I've never had any regrets and must have not come equipped with the mythical biological clock.
biological clock n.
An innate mechanism in living organisms that controls the periodicity or rhythm of various physiological functions or activities.
An internal system that controls an organism's circadian rhythms, the cycles of behavior that occur regularly in a day. In mammals, the biological clock is located near the point in the brain where the two optic nerves cross. In many birds, the biological clock is located in the pineal gland. In protists and fungi, the individual cells themselves regulate circadian rhythms.
The innate rhythm of behavior and body activity in living things. A twenty-four-hour cycle of body activity, which operates in some organisms, is called the circadian rhythm.
Note: Although the term biological clock refers to all innate timing mechanisms, it is often used when describing certain body functions that are subject to this rhythm, such as the loss of fertility with age.