function Change_year(bd_day, bd_month, bd_year)
{
var _age;
var d = new Date();

cur_day = d.getDate();
cur_month = d.getMonth() + 1;
cur_year = d.getFullYear();

_age = cur_year - bd_year;

if(cur_month < bd_month)
{
_age -= 1;
}
else if(cur_month == bd_month)
{
if(cur_day < bd_day) _age -= 1;
}

if(_age < 0) _age = 0;
return _age;
}