Adolescent
| Adolescent | |
|---|---|
| Chinese name | Adolescent |
| English name | Adolescent |
| Corresponding stage | Transition from childhood to adulthood |
| Age range | 10–19 years (WHO definition) |
Adolescent (English: Adolescent) refers to the population in transition from childhood to adulthood. According to the definition of the World Health Organization, adolescents are individuals aged 10 to 19 years, while "young people" cover the age range of 10 to 24 years[1]. The United Nations defines "youth" as the population aged 15 to 24 years[2]. Adolescence is a critical life stage during which individuals undergo rapid changes in physiology, psychology, and social roles.
The term adolescent originates from the Latin word "adolescere", meaning "to grow into adulthood"[3]. Before the 20th century, Western societies did not generally recognize adolescence as an independent developmental stage; it was only after the Industrial Revolution, with the spread of compulsory education and the implementation of child labor laws, that adolescence gradually became recognized as a specific transitional phase from childhood to adulthood[4].
The World Health Organization and the United Nations define adolescents as individuals aged 10 to 19 years, with 10 to 14 years considered early adolescence and 15 to 19 years later adolescence[5]. Different countries and cultures vary in their age definitions of adolescence, with some societies extending the adolescent period into the early twenties[3].
"Adolescent" and "Youth" are closely related but distinct concepts. The United Nations defines "youth" as individuals aged 15 to 24 years[2], while the World Health Organization defines "young people" as those aged 10 to 24 years[1]. Legally, the United Nations Convention on the Rights of the Child defines "child" as any person under the age of 18 years[6], so adolescents aged 18 and above are generally considered adults under the law.
Adolescence is marked by the onset of puberty. Puberty is the physiological process of transition from childhood to adulthood, accompanied by growth spurts, gonadal development, and the emergence of secondary sexual characteristics. During this period, various body systems undergo significant changes: skeletal and muscular tissues grow rapidly, the endocrine system becomes highly active, and increased secretion of sex hormones promotes the maturation of the reproductive system[3].
Adolescence is a period of rapid cognitive development. Higher-order cognitive functions such as abstract thinking, reasoning ability, and metacognition improve significantly during this time. Cognitive psychologist Jean Piaget classified this stage as the "formal operational stage," in which adolescents begin to systematically engage in hypothetico-deductive reasoning. Concurrently, adolescents' emotional experiences become more complex and intense, self-awareness increases, they reflect on personal identity and social roles, and the desire for psychological independence and autonomy becomes increasingly prominent[3].
Adolescents undergo a transition from family dependence to autonomy in their social roles. The family remains an important support system for adolescents' emotional and behavioral development, particularly parental support and guidance, which have a positive impact on academic achievement and behavioral norms[7]. At the same time, the importance of peer relationships increases significantly during adolescence. Peer groups provide emotional support and social identity for adolescents, with their influence being particularly prominent during mid-adolescence[8]. These two social environmental systems—family and peers—interact to shape the socialization trajectory of adolescents.
Adolescence is a critical stage of growth and development, during which nutritional status, physical activity, and lifestyle habits have profound effects on current and future health. The World Health Organization points out that many health behaviors established during adolescence persist into adulthood; therefore, cultivating healthy lifestyles during this stage has important preventive significance[1].
Common physical health problems among adolescents include malnutrition, obesity, myopia, and musculoskeletal issues[9]. A balanced diet, adequate sleep, and regular physical exercise help promote normal growth and physical health in adolescents.
Adolescence is a sensitive period for mental health development. Due to the combination of physiological changes, academic stress, and social needs, some adolescents may experience emotional disturbances such as anxiety and depression[9]. Positive family relationships and peer relationships have a protective effect on adolescents' mental health, reducing the risk of maladaptive behaviors and negative emotions[8].
Education is a core component of adolescents' socialization process. The vast majority of adolescents receive systematic basic education at the secondary school level. School education not only imparts knowledge but also promotes adolescents' moral development, social cognition, and civic awareness through curriculum design, school culture, and extracurricular activities[10]. Some adolescents choose to pursue vocational education or skills training in preparation for entering the labor market.
Internationally, the United Nations Convention on the Rights of the Child establishes a basic rights framework for adolescents under 18, including the rights to survival, development, participation, and protection[6]. The United Nations has also formulated the Standard Minimum Rules for the Administration of Juvenile Justice (the Beijing Rules), providing guiding principles for juvenile justice systems[11]. Many countries and regions have specialized juvenile justice systems that differ from adult judicial procedures, emphasizing education and protection for adolescents.
- ↑ 1.0 1.1 1.2 World Health Organization: Adolescent health
- ↑ 2.0 2.1 United Nations: Frequently Asked Questions on Youth
- ↑ 3.0 3.1 3.2 3.3 Encyclopaedia Britannica: Adolescence
- ↑ Past and present of adolescence in society: The 'teen brain' debate in perspective
- ↑ 『Child』, 『adolescent』 and 『youth』: Definitions, Sri Lanka Journal of Child Health, 2023
- ↑ 6.0 6.1 United Nations Convention on the Rights of the Child
- ↑ The Role of Parental Influences in Chinese Adolescents' Academic Achievement through Shaping Friendship Network Dynamics, Journal of Youth and Adolescence, 2026
- ↑ 8.0 8.1 家庭衝突的困境與同輩群體的緩衝——青少年情感社會化路徑分析
- ↑ 9.0 9.1 亞健康問題突出 近六成青少年存在負面情緒, 廣州青年報, 2026
- ↑ 未成年人學校保護規定
- ↑ 聯合國少年司法最低限度標準規則（北京規則）