oracle pl sql VALUE_ERROR

CREATE TABLE TB_USER
(
ID INTEGER PRIMARY KEY,
USER_NAME VARCHAR2(20) NOT NULL,
USER_AGE INTEGER NOT NULL
);

CREATE SEQUENCE SEQ_USER
INCREMENT BY 1
START WITH 1
NOMAXVALUE
NOCYCLE
CACHE 10;

CREATE OR REPLACE TRIGGER TR_USER BEFORE INSERT ON TB_USER FOR EACH ROW
BEGIN
SELECT SEQ_USER.NEXTVAL INTO :NEW.ID FROM DUAL;
END;

CREATE OR REPLACE PROCEDURE PRO_VALUE_ERROR(USER_ID IN INTEGER) AS
V_AGE INTEGER;
V_NAME VARCHAR2(5);
BEGIN
SELECT USER_NAME, USER_AGE INTO V_NAME, V_AGE FROM TB_USER WHERE ID=USER_ID;
EXCEPTION
WHEN VALUE_ERROR THEN
DBMS_OUTPUT.put_line('v_name is too short');
END;

SQL> SELECT * FROM TB_USER WHERE ID=505;

ID USER_NAME              USER_AGE
---------- -------------------- ----------
505 FOR_REVERSE_80               80

CALL PRO_VALUE_ERROR(505);

v_name is too short