Despite the fact that the current understanding of attention deficit and hyperactivity disorder (ADHD) has increased among mental health professionals, it is still under-diagnosed and under-treated in several European countries, leading to chronic impairment and higher disease costs. This workshop is intended to provide an update on the fundamental and important aspects of ADHD across the lifespan. Educational objectives of the workshop include discussing psychopathology, neuroimaging, diagnostic tools, and differential diagnosis of ADGD. Gender differences in ADHD are poorly understood possibly because of the underrepresentation of females in the literature. Therefore, a comparison of ADHD between males and females will be discussed in light of a systematic review. Psychoeducation and general treatment approach, and more specifically, pharmacological treatment of ADHD with comorbidities are the other topics that will be covered during the session. By participating in this workshop, the participants will have a platform to ask questions, discuss and share opinions on fundamental aspects of ADHD from a lifespan perspective.