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Although some parents think teens, especially by 18, are fully developed adults and should have the same level of maturity as adults, the frontal lobe of the brain does not reach full maturity until 25 [1].
This helps explain why teens often struggle to regulate their emotions, control their impulses, and organize or plan tasks. Understanding brain development can greatly support parents, caregivers, and anyone who works with youth in offering age-appropriate support.
What is The Frontal Lobe?
The prefrontal cortex (PFC), located in the frontal lobe, is an essential brain region for complex cognitive functioning. It controls tasks such as planning, organizing, making judgments, and controlling impulses. It helps teens achieve their goals, regulate their emotions, and adjust their reactions and behaviors under stress.
The prefrontal cortex is often the last brain region to develop because it handles complex critical thinking skills that build on earlier brain systems. The ongoing development of the prefrontal cortex during the teenage years and into the mid-20s explains why youth often show increased impulsivity and risk-taking behaviors [2].
Teens may struggle with decision-making and emotional regulation compared to adults. However, as the prefrontal cortex strengthens with age and experience, individuals typically gain improved self-control, better planning abilities, and a greater capacity for empathy and social understanding.
Brain Growth vs Brain Development
It’s important to understand the difference between brain growth and brain development, which are often confused. Brain growth refers to the physical increase in the brain’s size, and the brain reaches almost 90% of its adult size by age 6 [3].
Brain development or maturity is more complex and involves the “wiring” and reorganization of the brain, rather than just its volume. It includes the formation of new neural connections (blooming) and the reduction of old or unnecessary connections (pruning) [3].
Frontal Lobe Development By Age
Throughout development, the brain goes through various stages characterized by different changes in cognitive functioning or growth [4].
Early Childhood (0–5 years)
During early childhood, from ages 3 to 6, the frontal lobe of the brain undergoes rapid growth. However, the prefrontal cortex’s functions are still extremely limited. Children at this stage of development are still developing basic cognitive skills such as language use and gestures.
Middle Childhood (6–12 years)
During elementary school, all lobes of the brain continue to grow in size, and cognitive skills become more logical and organized. Children around this age often develop the skills to plan and work towards goals, although their attention span is still limited. During this stage, children often gain an understanding of numbers, math, spelling, and concepts such as attention and planning skills.
Adolescence (13–19 years)
The adolescent brain continues to develop, and this period involves synaptic pruning, where neural connections are reduced to increase efficiency. The frontal lobe is still fine-tuning itself; this, combined with hormone fluctuations caused by puberty, makes it typical for teens to take risks and struggle with mood swings and emotional outbursts.
Early Adulthood (20–25 years)
The frontal lobe continues its maturation into early adulthood. Most experts agree that the brain reaches full development around 25, although this can vary, especially with lifestyle factors, trauma, or drug use, which can stunt or accelerate brain development.
Why Does It Matter? How Does Development Impact Teens?
Understanding brain development is important not only for parents but also for health professionals, educators, lawmakers, and anyone else who works with teens or kids. The systems that regulate impulse control and decision-making often explain why this age group is known to be particularly difficult, with higher risks of drug use, accidents, and binge drinking.
Some teens may “look” or “act” like adults, or get called “mature” for their age, but expecting them to have the adult level of thinking is simply unrealistic:
- Implications for Parenting: Parents who understand their teens’ brain development can better support teens with patience, guidance, and age-appropriate expectations rather than expecting adult-level maturity.
- Implications for Education: Educators can tailor learning by providing structured environments, clear expectations, and support for developing executive functioning skills.
- Juvenile Justice: Brain development supports rehabilitative approaches rather than solely punitive measures in juvenile justice, recognizing that many risky behaviors stem from developmental immaturity rather than fully formed moral judgment.
What Affects Brain Development?
Although age is a guiding factor in brain development, several lifestyle choices and physical or mental health conditions can stunt brain development. Some of these include [1]:
- Sleep: High-quality sleep, at least 8 to 10 hours a night for teens, helps the brain organize and consolidate memories as well as calms the amygdala, which can reduce anxiety or emotional dysregulation.
- Trauma: Being exposed to trauma such as abuse or neglect at a young age negatively impacts the prefrontal cortex and limbic system.
- Nutrition: Proper nutrition provides essential building blocks such as omega-3 fatty acids and vitamins for brain growth, especially myelination and synaptic pruning
- Substance Use: Alcohol, drugs, and other substances disrupt brain maturation by damaging developing neural circuits, especially in the frontal lobe. Early substance use is linked to lasting cognitive deficits, increased impulsivity, and higher risks for addiction.
Helpful Insights for Parents at Clearfork Academy
Clearfork Academy is a network of behavioral health facilities in Texas committed to helping teens recover from substance abuse and mental health disorders. We offer medical interventions for addiction, mental health therapies, and medication services, as well as psychoeducation tailored to parents of teens.
Clearfork understands the importance of addressing concepts that impact teens’ lives, including brain development and maturation. Contact our team to connect with a workshop for parents and caregivers to explore these topics in more depth.
Sources
[1] Sharma, S. et al. (2013). Maturation of the adolescent brain. Neuropsychiatric disease and treatment, 9, 449–461.
[2] Hathaway, W. et al. 2023. Neuroanatomy, Prefrontal Cortex. Stats Pearl.
[3] The Human Safety Net. 2022. 90% – Scientific studies show child’s brain reaches 90% of adult size between 0-6 years.
[4] Beckson, M. et al. 2001. Age-Related Changes in Frontal and Temporal Lobe Volumes in Men. JAMA Psychiatry.
Mike Carter, LCDC
Alumni Relations Manager
Mike grew up on a dairy farm in Parker County, Texas. At the age of 59, he went back to college and graduated 41 years after his first graduation from Weatherford College. God placed on his heart at that time the passion to begin to help others as they walked from addictions, alcoholism, and abuse of substances. He is a Licensed Chemical Dependency Counselor and in the past few years he has worn many hats, from intake and assessment, group counseling, individual and family counseling, intensive outpatient and now he is working with clients, therapist, and families on discharge planning and aftercare. He also coordinates our Alumni Outreach Program.
