1.4 Mental development VS Physical developmentWhile big changes take place in people's minds during the teenage years, their bodies undergo big changes as well. In terms of physical development, teenagers experienced rapid and drastic changes in their bodies.Boys are close to completing their physical growth, teen boys voices will lower, and facial hair will appear. They may continue to gain height and muscle. Many boys like to model their appearance on somebody they admire, Like a movie star or simply an older brother.Girls usually reached full physical development in their teenage years. Many teenage girls are overly concerned about how they look. Since teens are very concerned about the opinions of others. They are often unhappy with their bodies, size, shape, and weight. Some even go to the extreme of starving themselves or going on unhealthy diets. This is old to maintain a certain book, Who did you want to look like when you were a team?