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The normal pattern of body hair growth starts with pubic and axillary hair. For a very hairy man, the next area to grow hair is the legs, and then the abdomen and chest. The area around the coccyx can grow hair quite early in pubescence and the rest of the back is much later. Facial hair is variable in growth pattern, usually growing after the first appearance of abdominal or chest hair, giving a full pattern before the chest and abdominal hair. Upper arm hair grows quite late in the process and forearm hair is the most widely variable in the age at which growth occurs. Forearm hair can grow at any time from about the age of fourteen to twenty-five. It can grow before or after chest, abdomenal or facial hair. Men who are less hairy will follow the same basic pattern as the hairiest men but leaving out the areas where they do not have hair. The least hairy men just have pubic, axillary and facial hair. Growth pattern in women is similar but any woman who has significant quantities of body hair apart from pubic, axillary, leg and forearm hair should consult the doctor. There is a possibility of hormonal imbalance that should be investigated for each woman that is too hairy. It is not count the sometimes heavy downy facial hair that some women have as significant growth. The age variation for the onset of puberty that is biologically normal is nine to 21 years-old. However, the vast majority of people reach puberty between the ages of ten and sixteen. Given these wide tolerances for normality, it is not surprising that doctors consider almost everyone to be normal with regard to hair growth. There are some abnormalities such as precocious puberty in very young children and there are people who grow hair severely outside the normal sequence. In essence, some doctors define normality as a growth pattern that will give rise to a normal individual of normal height and intelligence without any physical disability, including sterility.