function determineAge(birthdate){
        var dateInput = new Date(birthdate);
        var today = new Date();
        var dateInputYear = dateInput.getYear();
        var todayYear = today.getYear();
        var dateDiff = todayYear - dateInputYear;

        if(dateInput.getMonth() > today.getMonth()){
                return dateDiff - 1;
        }

        if (dateInput.getMonth() == today.getMonth() && dateInput.getDate < today.getDate()){
                return dateDiff -1;
        }



        return dateDiff
}