Relation between class instance and static methods

Is there any particular relation between class instance (e.g variables that declared by static/final) and static methods(e.g class methods) ?

I hop you understand what i mean.

Static and non-static methods/classes are entirely different beasts. Let's use an example of object-oriented programming. Say I have a class called "Person", with a constructor called Person(), with the instance variables declared as myAge (set as 0), and a method called Birthday():

int myAge;

public Person(){
    myAge = 0;
}

public void Birthday(){
    myAge += 1;
}

In my main method, this class would be used like this:

Person Sajjad = new Person();
Sajjad.Birthday();

When I create a new person, which is you, your age is 0, because our constructor's default values are 0 for myAge. Once I apply the Birthday() method on you, your age goes up by one, through the increment.

As for static methods, there's no object-oriented principles in it. There are uses for it.. I usually use it for simple math.

public static double addValues(double a, double b){
    return a + b;
}

In my main:

int sum;
sum = addValues(1, 2);
System.out.println(sum);

Output:

3

See how above there's no need to declare a new objects? Static methods are easier to prototype, but in the long run I definitely go with object-oriented principles because it makes maintaining code in the long run so much easier. Also, I don't need to clutter my main method with unnecessary lines of code.

P.S. If the code is wrong, it's really just some pseudo code I whipped up.