What is Flat Feet and Who Can Get Flat Feet? Flat feet is a condition in which the arch of the foot disappears and the foot presses flat on the ground. Although it is considered normal that the arch of the foot does not develop until the age of 3-5 in children, this arched structure is expected to form until the age of 10. In adults, flat feet can be caused by childhood or age-related foot problems, trauma or calcification. Flat [...]