The adolescent stage of human development generally refers to the period of life between childhood and adulthood, and is characterized by significant physical, emotional, and cognitive changes. Depending on which expert you ask, the age range can be from 10 years old to mid-twenties, but is generally age 12 to 15.

As a result of improvements in nutrition and healthcare, people reach puberty earlier and live longer than in past eras.

Girls generally go through a growth spurt sooner than boys. So a sister that has always been shorter than her older brother may be taller and stronger for a year or so, until he finally grows into his adult-size body.

Adolescents often experience “sleep drunkenness,” which is a state of grogginess and confusion that occurs when they are woken up abruptly.

Adolescents are more likely to engage in risky behaviors like drug use, drinking, and unprotected sex, as they test the limits of their newfound independence.

The adolescent brain goes through a pruning process where it eliminates unused neural connections.

The teenage years are a time when individuals begin to develop a sense of humor and enjoy joking around with friends.

Adolescents are more likely to engage in “self-talk,” or talking to themselves, as a way to process their thoughts and emotions.

Adolescents often experience a heightened sense of self-consciousness and may feel like they are constantly being judged by others.

Adolescent boys are more likely to experience body dysmorphia and muscle dysmorphia due to societal pressure to be muscular and fit. For some boys, penis size becomes a concern.

The adolescent brain is more susceptible to addiction because of the underdeveloped prefrontal cortex.

Adolescents require more sleep than adults, but their natural sleep cycle causes them to stay up later and wake up later.

During puberty, the body undergoes rapid growth and hormonal changes, leading to increased hunger and appetite.

Adolescents have a greater tendency to conform to peer pressure and follow trends.

Adolescent girls are more likely to experience depression and anxiety than boys.

Adolescent girls are also more likely to experience body image issues and eating disorders.

Adolescents have a more heightened sense of social justice and fairness.

The adolescent brain is more sensitive to stress, which can have a long-term impact on mental health.

The adolescent brain is more responsive to rewards, which can lead to addictive behaviors.

Adolescents are more likely to experience mood swings and emotional turbulence.

Adolescents often experience conflicts with authority figures such as parents and teachers.

Adolescents are more likely to engage in binge drinking and drug use.

Adolescents often experience a sense of alienation and feel like they don’t fit in.

The teenage years are a time when individuals start to form close friendships and experience loyalty and betrayal.

Adolescents often experience a sense of nostalgia for their childhood, as they begin to realize that they are no longer children.

The adolescent brain is more susceptible to the effects of peer pressure due to increased activity in the amygdala, which processes social information.

The adolescent stage is also a time when individuals begin to explore their spirituality and religious beliefs.

The adolescent stage is a time when individuals begin to develop their own moral code and ethical beliefs.

Adolescents are more likely to experience “fear of missing out” (FOMO) and anxiety related to social media use.

The adolescent stage is often marked by an increased interest in social justice and political activism.