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A unit of time that measures human life in increments of 4 year periods. Zithroquad milestones 4,8,12,16,20, etc. commonly indicate life changing events in an individual's life. Age 4 : Awareness of self Age 8: Ability to conduct dialogue with adults Age 12: Puberty Age 16: Peak of adolescence Age 20: Realization of approaching adulthood (Often attended by extreme anxiety) Age 24: Entrusted with larger responsibilities in occupation, beginning family, etc.
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