For example, the average age of the onset of menstrual periods in girls was 15 in 1900. By the 1990s, this average had dropped to 12 and a half years of age.uberty facts. 1  Puberty is the period of sexual maturation and achievement of fertility. 2  The time when puberty begins varies greatly among individuals; however, puberty usually occurs in girls between the ages of 10 and 14 and between the ages of 12 and 16 in boys.
Herbert Hoover was the president of the U.S. when the great depression began in 1929.
Franklin D. Roosevelt. Assuming the Presidency at the depth of the Great Depression as our 32nd President (1933-1945), Franklin D. Roosevelt helped the American people regain faith in themselves.Assuming the Presidency at the depth of the Great Depression, Franklin D. Roosevelt helped the American people regain faith in themselves.n 1928 Roosevelt became Governor of New York. He was elected President in November 1932, to the first of four terms. By March there were 13,000,000 unemployed, and almost every bank was closed.