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Lack of ovulation before the age of forty is considered to be premature ovarian failure. In such cases, it is always a good idea to consult with one's doctor to seek out causes, other related conditions and to consider treatment options.
PCOS does not cause early menopause, but it can cause missed periods. PCOS is something that is best monitored by your doctor because it can actually cause a lot of problems outside of reproductive issues. Insulin resistance, weight gain, joint pain, and depression can all be side effects of PCOS.
In women, a lack of follicle stimulating hormone leads to incomplete development at puberty and poor ovarian function (primary ovarian failure). In this situation ovarian follicles do not grow properly and do not release an egg, thus leading to infertility. Since levels of follicle stimulating hormone in the bloodstream are low, this condition is called hypogonadotrophic-hypogonadism.
Both will cause premature bearing failure.
Lack of maintenance, oil and filter changes.
This may happen but not because of premature child. But mostly, late or early puberty can be accounted for by genes .
The tensioner maintains proper tension on the serpentine belt. Too much tension can cause premature failure of the belt, water pump, AC compressor, alternator, power steering... Too little tension can cause belt slipping, resulting in premature belt failure and poor operation of the water pump, AC compressor, alternator... AND when those pulleys are slipping, they generate a lot of heat which can cause premature failure of the water pump... you get the idea.
Since the nation of Afghanistan is still at war, it may be premature to declare the war a success.
McDonald Dam failure happened in 1900.
As your health care provider probably explained, you need to contact them to report the lack of bleeding after progesterone challenge. At that point, s/he'll tell you the next step in your course of diagnosis and treatment.
Most commonly after 40, although it can happen at any age.
Ovary