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ENDOCRINE DISRUPTORS. The PAST CENTURY and a HALF. Part B
Primary sex characteristics are those present at birth. Secondary sex characteristics are those that appear during puberty. “Since 1850, the typical age of onset of menarche [periods] in young girls has dropped from 16 to about 12.5 years of age. Several guidelines now set the onset of secondary sexual changes in girls at age 8 (with menarche as early as age 10) and the onset of secondary sexual changes in boys at age 9 years. (From the site Healio). HELLO! We’re talking breasts and balls here – at ages 8 and 9!?!