Final answer:
Chronological Age is not universally defined; it varies by culture and other factors. Social milestones differ globally, and age-related expectations are influenced by culture, socio-economic status, and personal health.
Step-by-step explanation:
Chronological Age is not universally defined as it varies across cultures. Biological milestones such as puberty are generally universal, but social milestones, like the age of starting school, can differ significantly. For instance, children in developed countries typically begin school at 5 or 6 years of age, whereas those in some developing countries may start later or not attend at all.
Additionally, not all normative events, which are experiences expected to happen at certain ages, are universal. The concept of age and the expectations surrounding it can be influenced by numerous factors including culture, socio-economic status, education, and health.
Thus, the idea that chronological age is universally defined is False. Adulthood and other age-related milestones can be fluid and subjective, shaped by a multitude of external influences and personal experiences.