At what age did people in the Zhou Dynasty begin to perform military service?

According to Zhou Li and other ancient books, China people began to serve at the age of 20, participated in military training and provided military labor; At the age of 30, he officially took turns to join the army; After the age of 50, he only participated in the war and no longer participated in general labor and training; Retire after 60. Usually, one in ten people in China is drafted into the army, and they must bring their own rations and clothes.