Adolescence

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Adolescence is a transitional stage of physical and psychological development that generally occurs during the period from puberty to legal adulthood (age of majority).wikipedia
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Developmental psychology

developmental psychologistchild psychologychild psychologist
Developmental psychologists might focus on changes in relations with parents and peers as a function of school structure and pubertal status.
Originally concerned with infants and children, the field has expanded to include adolescence, adult development, aging, and the entire lifespan.

Preadolescence

preteentweenpre-teen
For example, puberty now typically begins during preadolescence, particularly in females.
Preadolescence, also known as pre-teen or tween, is a stage of human development following early childhood and preceding adolescence.

Development of the human body

growthdevelopmentalhuman development
Adolescence is a transitional stage of physical and psychological development that generally occurs during the period from puberty to legal adulthood (age of majority).
This continues throughout life: through childhood and adolescence into adulthood.

Puberty

pubescentpubescencesexual development
Adolescence is a transitional stage of physical and psychological development that generally occurs during the period from puberty to legal adulthood (age of majority).
Derived from the Latin puberatum (age of maturity), the word puberty describes the physical changes to sexual maturation, not the psychosocial and cultural maturation denoted by the term adolescent development in Western culture, wherein adolescence is the period of mental transition from childhood to adulthood, which overlaps much of the body's period of puberty.

Facial hair

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Facial hair in males normally appears in a specific order during puberty: The first facial hair to appear tends to grow at the corners of the upper lip, typically between 14 and 17 years of age.
Men typically start developing facial hair in the later years of puberty or adolescence, between seventeen and twenty years of age, and most do not finish developing a full adult beard until their early twenties or later.

Moustache

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It then spreads to form a moustache over the entire upper lip.
The moustache forms its own stage in the development of facial hair in adolescent males.

Tanner scale

Tanner stageTanner stagesTanner staging
The changes in secondary sex characteristics that take place during puberty are often referred to in terms of five Tanner stages, named after the British pediatrician who devised the categorization system.
The Tanner scale (also known as the Tanner stages or Sexual Maturity Rating (SMR)) is a scale of physical development in children, adolescents and adults.

Adam's apple

laryngeal prominenceAdams AppleAdam's Apples
It is the stage of life characterized by the appearance and development of secondary sex characteristics (for example, a deeper voice and larger adam's apple in boys, and development of breasts and more curved and prominent hips in girls) and a strong shift in hormonal balance towards an adult state.
During adolescence, the thyroid cartilage grows together with the larynx.

Dual systems model

dual-system modelmaturational
The dual systems model proposes a maturational imbalance between development of the socioemotional system and cognitive control systems in the brain that contribute to impulsivity and other behaviors characteristic of adolescence.
The dual systems model, also known as the maturational imbalance model, is a theory arising from developmental cognitive neuroscience which posits that increased risk-taking during adolescence is a result of a combination of heightened reward sensitivity and immature impulse control.

Youth

young peopleyoung adultsyoung adult
This understanding of youth was based on two then new ways of understanding human behavior: Darwin's evolutionary theory and Freud's psychodynamic theory.
Around the world, the English terms youth, adolescent, teenager, kid, and young person are interchanged, often meaning the same thing, but they are occasionally differentiated.

Imaginary audience

Being able to introspect may lead to two forms of adolescent egocentrism, which results in two distinct problems in thinking: the imaginary audience and the personal fable.
Though this state is often exhibited in young adolescence, people of any age may harbor a fantasy of an imaginary audience.

Self-consciousness

self-consciousself consciousnessself-consciously
It is also relevant in social cognition, resulting in increased introspection, self-consciousness, and intellectualization (in the sense of thought about one's own thoughts, rather than the Freudian definition as a defense mechanism).
Adolescence is believed to be a time of heightened self-consciousness.

Human height

heightgrowth spurtstature
The adolescent growth spurt is a rapid increase in the individual's height and weight during puberty resulting from the simultaneous release of growth hormones, thyroid hormones, and androgens.
Both hormones operate on most tissues of the body, have many other functions, and continue to be secreted throughout life; with peak levels coinciding with peak growth velocity, and gradually subsiding with age after adolescence.

Crowds (adolescence)

crowdscrowd membership
Adolescents begin by defining themselves based on their crowd membership.
Crowds are large groups of adolescents defined by their shared image and reputation.

Childhood

childchild well-beingChildren
During childhood, siblings are a source of conflict and frustration as well as a support system.
Childhood is the age span ranging from birth to adolescence.

G. Stanley Hall

Granville Stanley HallStanley HallGranville S. Hall
The formal study of adolescent psychology began with the publication of G. Stanley Hall's "Adolescence in 1904".
He was instrumental in the development of educational psychology, and attempted to determine the effect adolescence has on education.

Adolescent cliques

cliquesThe Jensyouth social cliques
During early adolescence, adolescents often associate in cliques, exclusive, single-sex groups of peers with whom they are particularly close.
Adolescent cliques are cliques that develop amongst adolescents.

Relational aggression

abusive relationshipabusiveabusive relationships
Both physical and relational aggression are linked to a vast number of enduring psychological difficulties, especially depression, as is social rejection.
Although it can be used in many contexts and among different age groups, relational aggression among adolescents in particular, has received a lot of attention.

Identity crisis

identity crisesIdentity crisis (psychology)crisis of identity
Erikson's theory of stages of development includes the identity crisis in which adolescents must explore different possibilities and integrate different parts of themselves before committing to their beliefs.
In psychology, identity crisis is the failure to achieve ego identity during adolescence.

Coming out

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Many adolescents may choose to come out during this period of their life once an identity has been formed; many others may go through a period of questioning or denial, which can include experimentation with both homosexual and heterosexual experiences.
Many LGBT people say that this stage began for them during adolescence or childhood, when they first became aware of their sexual orientation toward members of the same sex.

Questioning (sexuality and gender)

questioninggender questioningquestion
Many adolescents may choose to come out during this period of their life once an identity has been formed; many others may go through a period of questioning or denial, which can include experimentation with both homosexual and heterosexual experiences.
Becoming aware of sexual feelings is a normal developmental task of adolescence.

Sex education

sexual educationsex educatorsexuality education
But, although 9 in 10 sex education instructors across the country believe that students should be taught about contraceptives in school, over one quarter report receiving explicit instructions from school boards and administrators not to do so.
Traditionally, adolescents in many cultures were not given any information on sexual matters, with the discussion of these issues being considered taboo.

Youth culture

youthCultureteen culture
Furthermore, distinguishing characteristics of youth, including dress, music and other uses of media, employment, art, food and beverage choices, recreation, and language, all constitute a youth culture.
Youth culture is the way children, adolescents and young adults live, and the norms, values, and practices they share.

Adolescent sexuality

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These sexual desires are then dramatized regarding teen sex and seen as "a site of danger and risk; that such danger and risk is a source of profound worry among adults".
Adolescent sexuality is a stage of human development in which adolescents experience and explore sexual feelings.

Self-discrepancy theory

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Exploring these possibilities may result in abrupt changes in self-presentation as the adolescent chooses or rejects qualities and behaviors, trying to guide the actual self toward the ideal self (who the adolescent wishes to be) and away from the feared self (who the adolescent does not want to be).
Discrepancies between own self-concept, and other self-concept can be described as an identity crisis, which often occurs during adolescence.