The human is the product of the specific interaction of natural and social factors. Periods of age were divided by specialists differently; Demeter, A. [80] divides from a functional point of view the school age of 6-18 years old into three periods, unequal in duration, namely: - the small one (ante pubertal) school period 6-11 years-old; - middle school period (puberty) 11-13 years-old in girls, 12-14 years-old in boys; -high school period (post-puberty) 14-18 years-old. This classification is based on the major criterion of the physiological and mental factors represented by puberty, bringing psychophysiological changes with deep consequences in terms of physical constitution, determining the entire somato-functional and mental development of the pupil.