As for menarche age, recent results of the “Körmend Growth Study” series are in accordance with those of regional studies (Budapest, Kaposvár, Jászság, Székesfehérvár, Érd, and Makó) in Hungary. The age at menarche was estimated based on data acquisition with “status quo” method and probit analysis, respectively. The median of the estimated values show a positive secular trend in the 20th Century. In the 21st century, this trend became less expressed. Our recent Körmend research in 2018, however, revealed a significant decrease in the age of the first period (M=12.43 year). The reason is probably the robust and significant increase of body mass or even more, that of body fat. Proper knowledge concerning the sexual maturation process is inevitable for physical instructors, coaches and other sports experts, inasmuch as physical performance of children greatly differs in distinct stages of sexual maturation. The seven item conditional motor capacities test series confirms this as well.