In human beings, puberty and adolescence are the result of sex glands. Testes in males produce testosterone, a male sex hormone, which is associated with male puberty. In boys, this stage appears an age of 13-14 years. Ovaries in females produce oesterogen, a female sex hormone, is responsible for all the changes associated with female puberty. In girls, this stage is usually attains at an age of 10-12 years.