Human development is a lifelong process of physical, behavioral, cognitive, and emotional growth and change. In the early stages of life—from babyhood to childhood, childhood to adolescence, and adolescence to adulthood—enormous changes take place. Throughout the process, each person develops attitudes and values that guide choices, relationships, and understanding.

Sexuality is also a lifelong process. Infants, children, teens, and adults are sexual beings. Just as it is important to enhance a young person's physical, emotional, and cognitive growth, so it is important to lay foundations for an adolescent's sexual growth. Adults have a responsibility to help young people understand and accept their evolving sexuality.

Each stage of development encompasses specific markers. The following developmental guidelines apply to most young people in this age group. However, each adolescent is an individual and may reach these stages of development earlier or later than other teens the same age. When concerns arise about a specific teen's development, parents or other caregivers should consult a doctor or other adolescent development professional. Physical Development

Most teens ages 13 to 17 will

• Complete puberty and the physical transition from childhood to adulthood
• Reach nearly their adult height, especially females [Males continue to grow taller into their early twenties.]