cookie getmaxage

i can't collect cookie maxage always advantage -1

creating cookie:

cookie securitycookie = new cookie("sec", "somevalue");
securitycookie.setmaxage(expiration_time);

retrieve cookie:

cookie[] cookies = request.getcookies();
if (cookies != null) {
    for(int i=0; i<cookies.length; i++) {
        cookie cookie = cookies[i];
        ("sec".equals(cookie.getname())){
            int age = cookie.getmaxage();
        }
    }
}

i am always removing age = -1

also i check firefox cookie genocide i uncanny date.

thx