The arch continues to develop throughout childhood, and by adulthood most people have developed normal arches. If a child’s foot does not develop normally by 8 years of age, it may be time to seek medical attention.
Custom arch supports (Orthotics) for kids can help support the joints so that they can finish developing. Painless flat feet are sometimes generic and are not a problem. When flatfoot occures in adulthood, it is commonly referred to as "fallen arches."