Age(18 years) checking with dynamic message!

[rakibdevs]

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$.formUtils.addValidator({
  name : 'adultcheck',
  validatorFunction : function(value) {
    var birthDate = new Date(value);
    var difdt = new Date(new Date() - birthDate);
    var age=difdt.toISOString().slice(0, 4) - 1970;
    if (age >= 18) {
        return true;
    }
    else if(age<0){
    	this.errorMessage="Not yet born!";
    	return false;
    }
    else{
    	this.errorMessage="Your age is under 18!";
	    return false;
    }	    
  },
});
$.validate();