Are There Different Types or Presentations of ADHD in Adults and Children? 

Yes, ADHD can present differently in adults and children, both in behaviour and in the brain. Although it is the same condition, ADHD brain function evolves over time due to age, environmental demands and maturity. Understanding these changes is key to providing age-appropriate support and identifying the condition at every stage of life. 

ADHD is a neurodevelopmental disorder, meaning it begins in childhood and affects how the brain grows and functions. Recent research, including brain scans of ADHD patients, shows that children and adults with ADHD often have different patterns of brain activity and connectivity. These brain differences in ADHD contribute to why symptoms appear more external and energetic in childhood, but more internal and subtle in adulthood. 

ADHD Types and Presentations by Age 

Here’s how the condition can vary across age groups: 

Children 

Hyperactivity and impulsivity are often more visible. Children may run, fidget, interrupt or act without thinking. These behaviours make diagnosis easier in school environments where expectations for attention and control are high. 

Adults 

 Physical hyperactivity tends to decrease, but struggles with focus, disorganisation and emotional regulation often remain. Adults may experience mental restlessness, missed deadlines and relationship difficulties. 

ADHD brain function over time 

Studies suggest differences in brain volume, delayed development of certain regions and altered neurotransmitter levels in those with ADHD. These patterns can change with age but continue to influence attention, memory and executive function throughout life. 

Three recognised presentations 

ADHD is classified into inattentive, hyperactive-impulsive and combined types. These can shift with age and life context. For example, a child with hyperactive symptoms may develop into an adult with primarily inattentive traits. 

Understanding how ADHD evolves from childhood into adulthood helps tailor diagnosis and treatment. Visit providers like ADHD Certify for personal consultations and guidance grounded in the latest brain-based research. 

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Can mindfulness practices benefit those with Adult ADHD vs. childhood ADHD.