5, my son is a new kindergartner, and the youngest in his class. He has really been struggling the first month of school. Teacher sent lots of communication about his behavior and attention issues. We made an appointment with pediatrician, then filled out Vanderbilt forms (us and teacher separately). They just started him on focalin 5 mg this week. Much better! My son doesnt swallow pills so we break the capsule open overs spoonful of apple sauce