The size of the prostate gland in a normal adult male is approximately 4 cm x 3 cm x 2 cm, so a 45 year old prostate is roughly the same and may vary slightly. The prostate is a uniquely male organ and is one of the organs of the genitourinary system. The prostate gland is connected to the bladder above and the urethra below. Normal adult male prostate size is 4 cm x 3 cm x 2 cm, with age the prostate will grow, usually occurring after the age of 40, 60 years old men in the population of prostate hyperplasia incidence is greater than 50%, 80 years old and above as high as 83%! Prostatic hyperplasia, commonly known as prostatic hypertrophy, is a chronic and common disease in older men, which can manifest as frequent urination, urinary urgency, increased nocturia, and difficulty in urination, etc. If you have any of the above symptoms, it is recommended that you seek medical attention in time to avoid delays in your condition.