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What is calendar age?
Calendar (Chronological) Age
It is the actual time elapsed since an individual’s birth
measured in years, months, and days
It is the simplest and most commonly used method to classify individuals by age
is important for legal, educational, and medical purposes.
Biological Age
Biological age refers to
the functional status of an individual's body systems compared to average norms.
It is determined by various biomarkers that reflect
physical health, physiological function, and risk of disease.
Biological age is influenced by factors such as genetics, lifestyle, diet, physical activity, and environmental exposures.
Thus, two individuals with the same chronological age may have different biological ages.
Acceleration and Deceleration of Growth and Development
Acceleration refers to a faster-than-average rate of growth or earlier onset of puberty in children compared to previous generations.
Deceleration is the opposite — a delay in growth or puberty relative to historical norms.
Factors influencing acceleration/deceleration include:
Diet and nutrition
Environmental quality (e.g., air, water, housing)
Level of physical activity
Time spent outdoors (sunlight exposure, physical interaction)