noun, Psychiatry. 1. an inability to speak, due to a physical defect, conscious refusal, or psychogenic inhibition. Origin of mutism.
1 A new study finds girls are developing breasts earlier than ever before; American boys and girls are entering puberty about five years younger than they did in 1920.
Age of Onset. The age of onset of puberty depends on a variety of factors, including nutrition. Most girls enter puberty between age 8 and 13, while guys enter puberty from age 10 to 15.A 2010 study published in Pediatrics by Frank Biro found that girls begin puberty at a younger age than in previous decades.ge of Onset. The age of onset of puberty depends on a variety of factors, including nutrition. Most girls enter puberty between age 8 and 13, while guys enter puberty from age 10 to 15.