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.
Male Growth Patterns. Boys generally hit their growth spurt about two years after girls, according to KidsHealth.org. Most boys grow most quickly between ages 12 and 15 and stop growing by age 16, but this depends on when they reach puberty. Boys usually continue developing muscles and gaining weight after they stop growing taller. The average adult male in the United States is about 69 inches tall, according to the CDC.