Boys are entering puberty at a younger age now than they did several decades ago, new research reveals.
"By contrast, testicular development in boys is very subtle," she noted. "To the point where even the boy himself doesn't necessarily notice it at the beginning. And also the environmental issues that we have long associated with earlier puberty in girls, such as being overweight and environmental exposure to endocrine [hormone]-disruptive chemicals, would actually be expected to slow puberty in boys, not hasten it. So, to see the same thing in boys is actually somewhat surprising."