PERDEV

• Pre-Natal - hereditary endowments and sex are fixed
• Infancy - Foundation age when basic behavior are organized
• Early childhood - Pre-gang age, exploratory, and questioning.
• Late childhood - Gang and creativity age when self-help skills, social skills, school skills, and play are developed.
• Adolescence - sex maturation and rapid physical development occur
• Early Adulthood - Age of adjustment to new patterns of life
• Middle age - adjustments to initial physical and mental decline
• Old age - Retirement age
• Infancy and the early childhood - 0-5
• Middle Childhood - 6-12
• Adolescence - 13-18
• Early Adulthood - 19-30
• Middle Adulthood - 31-60
• Later Maturity - 61+