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The testosterone levels in men usually decrease with age. They gradually begin to fall from the age of 40 years and decrease by approximately 0.3% per year. It has been estimated that up to 20% of men over 60 will experience a decline in androgen production that is significant enough to warrant a diagnosis of androgen deficiency.

Normal levels of testosterone fall between 250 and 800 nanograms of testosterone per deciliter of blood.

To determine whether or not you are experiencing a deficiency and what may be causing it, your doctor can measure the amount of testosterone in your blood with blood tests. In addition to measuring testosterone levels, doctors sometimes measure prolactin levels to make sure your pituitary gland is functioning properly. Further blood tests, such as serum FSH, LH and thyroid tests, may also be necessary.

could you give the full details in units

The typical male testosterone level is between 250ng/dl to 850 ng/dl. In a 55year old man normal testosterone levels are around 500 ng/dl.

so levels do state are lower than normal range

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