The prostate gland grows in men at puberty and secretes the fluid that carries the sperm. It remains a constant size until about the age of forty, then it begins to grow again. About 50% of men aged 60 have some enlargement of the prostate gland and this rises to 90% at the age of 80. This  enlargement may be benign – effectively harmless. However, it may be a sign of prostate cancer, the most common type of cancer in men. (With thanks to our sponsor 'Curriculum Press' for providing content for this podcast)