ADHD Symptom Presentation Across Age Groups

Attention-Deficit/Hyperactivity Disorder (ADHD) is a persistent neurodevelopmental condition. According to DSM-5 and ICD-11, the diagnostic similarities emphasize:

• Symptoms must persist for at least 6 months, beyond age-appropriate norms.
• Symptoms must begin before age 12.
• Symptoms must occur in two or more settings (home, school, work).
• Symptoms must cause significant impairment.
• Number of symptoms required: children need 6 or more, adults need 5 or more.

I. Pre-school (ages 3–5)

• Hyperactivity: constant running, climbing, inability to sit still.
• Impulsivity: interrupting, difficulty waiting turns.
• Inattention: short play span, shifting quickly between activities.
• Impact: difficulty following rules, peer interaction problems.

II. Primary School (ages 6–12)

• Inattention: incomplete homework, careless mistakes.
• Hyperactivity: fidgeting, leaving seat in class.
• Impulsivity: interrupting teachers or peers.
• Impact: academic decline, teacher conflict, peer rejection.

III. Secondary School (ages 13–18)

• Inattention: procrastination, poor sustained study.
• Hyperactivity: less physical running, but inner restlessness, excessive talking.
• Impulsivity: emotional outbursts, risky behaviors (fights, truancy).
• Impact: low self-esteem, school maladjustment, increased behavioral risks.

IV. Adulthood (18+)

• Inattention: difficulty focusing at work, missing details.
• Hyperactivity: inner restlessness, inability to relax, constant activity.
• Impulsivity: impulsive spending, reckless driving, hasty decisions.
• Impact: reduced work efficiency, interpersonal conflict, financial mismanagement.

Evidence shows ADHD symptoms often persist into adulthood if untreated, affecting multiple domains of life.