Chronological age refers to the actual amount of time a person has been alive, measured in years from birth to the present. It is the traditional way of measuring age.
IQ is a numerical measure derived from standardized tests that assess an individual's intelligence relative to their peers. It compares an individual's mental age with their chronological age, providing an indication of intellectual ability.
Developmental Milestones: Developmental milestones are key skills or abilities that most individuals acquire within a specific age range, serving as markers for typical development and growth.