Kids and teens with ADHD often squirm or fidget, and they tend to have a hard time sitting still. Some talk excessively or at inappropriate times. They may find it hard to take turns and have challenges getting along with others, among other symptoms.  As a person gets older, ADHD symptoms may change and often include: Frequently being late or forgetting things Impulsiveness Trouble staying organized Losing things often Becoming easily frustrated Trouble controlling anger Often feeling bored Substance abuse and addiction Low self-esteem Anxiety Problems at work Depression Mood swings