normal prostate size by age
A normal-sized prostate is about the shape and size of a walnut, approximately 16 cubic inches in the average 60-year old male. The prostate generally enlarges as men age. Keep Learning.
The normal prostate reaches 20 plus or minus 6 gm. in men between 21 and 30 years old, and this weight remains essentially constant with increasing age unless benign prostatic hyperplasia develops.