Also, Doppler can detect abnormal blood flow within the heart, which can indicate a problem with one or more of the heart's four valves. Color Doppler. Color Doppler is an enhanced form of Doppler echocardiography. With color Doppler, different colors are used to designate the direction of blood flow.
(I got armpit hair around 11 1/2 but everyone is different) From around age 13-16 but it can still happen earlier or later (maybe even 12 and 19) got mine just before i turned 14. Brent Lyday.
Early Puberty in Boys. Tweet. Puberty is the time when boysâ bodies and minds mature and they grow into young men. This usually starts when a boy is about 12 years old. Sometimes, though, a much younger boy starts to show the signs of puberty. This is called precocious (pre-KOH-shuss), or early puberty (PU-ber-ty).arly Puberty in Boys. Tweet. Puberty is the time when boysâ bodies and minds mature and they grow into young men. This usually starts when a boy is about 12 years old. Sometimes, though, a much younger boy starts to show the signs of puberty. This is called precocious (pre-KOH-shuss), or early puberty (PU-ber-ty).