In general, the standard volume of the prostate is 40mm x 30mm x 20mm, and a prostate of 49mm indicates a slightly enlarged prostate, which is not normal. Men’s prostate gland will gradually increase in size with age, so simply from the prostate a diameter of 49mm can only indicate that the prostate gland slightly exceeds the normal size, can not be clear the cause of the prostate volume is large. Possible causes include prostate enlargement, prostate congestion, prostate inflammation, cysts and tumors. Prostate enlargement in men may be related to factors such as age and testicular function. Typically men begin to experience prostate enlargement from the age of 45, with faster growth around the age of 50 and more pronounced symptoms by the age of 60. Common symptoms of prostate enlargement are increased nocturia, frequent urination, and straining to urinate.