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What is the definition of chronological age?

According to the American Psychological Association (APA), chronological age is the amount of time elapsed since an individual’s birth, typically expressed in months and years. This simple, universal metric, known to everyone through their birthdays, contrasts with other forms of age that measure health, development, or function. Understanding what is the definition of chronological age is the first step toward grasping a broader perspective on the aging process.