The age of the epiphysis is about 20 to 26 years old. The period of time when the human skeleton is in a semi-closed, semi-dormant state is generally between the ages of 20 and 26, and the epiphyses are also in a semi-closed state at this stage. The epiphysis is a cross-sectional image of the epiphyseal plate, which is a type of cartilage that gradually ossifies with growth. During the growth process, the epiphyseal plate will gradually ossify as we grow taller, but it will not thin out, thus ensuring the growth of our long bones. After a period of puberty, due to the continuous secretion of sex hormones, the epiphysis will no longer have the ability to continue to grow after gradual ossification, and will complete all the ossification, so there will be no more raw materials and space for growth, and at this time, the epiphysis is completely closed. Of course, the time of epiphyseal closure varies according to different individuals and different bone quality, and the age of the epiphysis when it is half-closed is also different.