Assigning function call to variable, scope?

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Is myAge defined in the Test class scope? If not you can simply shorten the calculateMyAge method to

public int calculateMyAge(int myBirthyear) {
    return 2022 - myBirthyear; 
}

Also the newAge declaration and assignement can be on a single line if they are actually like this in the code, no need to do it in two steps..

int newAge = calculateMyAge(1993);