In the 1970s the average age of Olympic gymnasts began to decrease. While it was not unheard-of for teenagers to compete in the 1960s—Ludmilla Tourischeva was 16 at her first Olympics in 1968—younger female gymnasts slowly became the norm as the sport's difficulty increased. Smaller, lighter girls generally excelled in the more challenging acrobatic elements required by the redesigned Code of Points. The 58th Congress of the FIG—held in July 1980, just before the Olympics—decided to raise the minimum age for senior international competition from 14 to 15. The change, which came into effect two years later, did not eliminate the problem. By the time of the 1992 Summer Olympics, elite competitors consisted almost exclusively of "pixies"—underweight, prepubertal teenagers—and concerns were raised about athletes' welfare.