Adolescence is referred to as a period when both men and women start developing external sexual features and this is also called puberty. This generally occurs when a child reaches 11 years age.
Some of the basic changes that happen in men are the voice breaks, gain in hair, beard grows comes, broader muscles and gain in weight.
Women start with their menstrual cycles that occur every 28 days. Some other characteristics such as breasts starts to develop, fat on hips, hair at different places of body including arm pit and pubic region.
For both men and women the onset of puberty may change their sexual behavior also. Some also develop pimples on the face as there are hormonal changes that are taking place. There may be mood swings in women and the parents should understand the children at this stage.