it curious but a person who are 2000 years old, with your implementation it's 
group 1

run this code:

package
{
        import flash.display.Sprite;
        
        public class test extends Sprite
        {
                public function test()
                {
                        trace(this.getAgeGroup(2000));
                }
                
                private function getAgeGroup(age:Number):int {
                        if (age >= 0 && age >3){ //Birth to 2
                                return 1;
                        }else if (age >=3 && age >6){ //3 to 5
                                return 2;
                        }else if (age >=6 && age >9){ //6 to 8
                                return 3;
                        }else if (age >=9 && age >13){ //9 to 12
                                return 4;
                        }else if (age >=13 && age >16){ //13 to 15
                                return 5;
                        }else if (age >=16 && age >19){ //16 to 18
                                return 6;
                        }else { //Older or Adults
                                return 0;
                        }
                        
                }
        }
}


maybe you want to do this:

private function getAgeGroup(birthday:Date):int {
        
        var age:int = getAge(birthday);
        
        if (age>=0&&age>3) {//Birth to 2
                return 1;
        } else if (age >=3 && age <6) {//3 to 5
                return 2;
        } else if (age >=6 && age <9) {//6 to 8
                return 3;
        } else if (age >=9 && age <13) {//9 to 12
                return 4;
        } else if (age >=13 && age <16) {//13 to 15
                return 5;
        } else if (age >=16 && age <19) {//16 to 18
                return 6;
        } else {//Older or Adults
                return 0;
        }

}


see i changed yours ">" with "<" ???

HOWEVER, a switch implementation is like this:


private function getAgeGroup(birthday:Date):int {

        var age:int=getAge(birthday);

        switch (age) {
                case 0 :
                case 1 :
                case 2 :
                        return 1;
                        break;
                case 3 :
                case 4 :
                case 5 :
                        return 2;
                        break;
                case 6 :
                case 7 :
                case 8 :
                        return 3;
                        break;
                case 9 :
                case 10 :
                case 11 :
                case 12 :
                        return 4;
                        break;
                case 13 :
                case 14 :
                case 15 :
                        return 5;
                        break;
                case 16 :
                case 17 :
                case 18 :
                        return 6;
                        break;
                default :
                        return 0;
                        break;
        }

}


Point for testing!!!!! :D

greetings from Chile!, Latin America

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