Attention deficit hyperactivity disorder (ADHD), a common childhood neurodevelopmental disorder, is typically first diagnosed when kids are 3 to 7 years old and can continue into adulthood. “Learning and thinking differences like ADHD are variations in how the brain processes information,” says Yvonne Cowser Yancy, Chief Administrative Officer and Head of Workplace at Understood.org. “It can affect skills such as reading, writing, math, focus, managing emotions, and organization,” she says.