Around the age of thirty, the last epiphany fuses in the body, resulting in decay. The joints will begin to degrade and these changes can be studied to determine the age. Mobile joints are the least good to determine as they decay faster than other joints. The changes expected to be seen in pubic symphysis are by observing the pubic symphyseal face. Ridges will develop in younger years but as humans, age builds up along the sides indicating an older age.