static block and static varibles in java

class Person{
    public static String name="Mr.zhang";
    //public static int age;
    static{
        age=20;
        System.out.println("initiate age");
    }
    public static int age;
    public static String address;
    static{
        address="beijing";
        age=34;
    }
public static void main(String[] args){
    System.out.println(name);
    System.out.println(age);
    System.out.println(address);
}

I define the variable——"age" after its initiation and I find that it works.Both of them are static so why they are not executed according to the sequence of code.