The only thing that is important to parents, is if they suspect that their child has ADD/ADHD,they need to insist on testing for them. This is even if the teacher disagrees, you know your child better than anyone. Not all need to be medicated, but if so, there are many differnt drugs out there other than Ritalin, which some children cannot tolerate. I am not familiar with the studies or percentages on ADD/ADHD and ages. But as a parent, I suggest to go with your gut instinct.