Adolescence is divided into 3 stages: early (12 to 14 years), middle (15 to 17 years), and late (18 to 20 years). While certain attitudes, behaviors, and physical milestones tend to occur at certain ages, a wide range of growth and behavior for each age is normal. These guidelines show general progress through the developmental stages rather than fixed requirements. It is perfectly natural for a teen to reach some milestones earlier and other milestones later than the general trend.
Physical Development
Most girls have completed the physical changes related to puberty by age 15.
Boys are still maturing and gaining strength, muscle mass, and height and are completing the development of sexual traits.
Emotional Development
May stress over school and test scores.
Is self-involved (may have high expectations and low self-concept).
Seeks privacy and time alone.
Is concerned about physical and sexual attractiveness.
May complain that parents prevent him or her from doing things independently.
Starts to want both physical and emotional intimacy in relationships.
Social Development
Is more and more aware of social behaviors of friends.
Seeks friends that share the same beliefs, values, and interests.
Friends become more important.
Starts to have more intellectual interests.
Explores romantic and sexual behaviors with others.
May be influenced by peers to try risky behaviors (alcohol, tobacco, sex).
Mental Development
Becomes better able to set goals and think in terms of the future.
Has a better understanding of complex problems and issues.
Starts to develop moral ideals and to select role models.
If you have any concerns about your teen's own pattern of development, check with your health care provider.