MYSQL LOAD DATA INFILE ignore duplicate rows (autoincrement as primary key)

One approach is to use a temporary table. Upload to this and use SQL to update tbl_member from temp table.

INSERT INTO tbl_member
SELECT Field1,Field2,Field3,... 
FROM temp_table
WHERE NOT EXISTS(SELECT * 
             FROM tbl_member 
             WHERE (temp_table.Field1=tbl_member.Field1 and
                   temp_table.Field2=tbl_member.Field2...etc.)
            )

Create a UNIQUE index on the age column, then:

LOAD DATA INFILE 'member.csv'
IGNORE INTO TABLE tbl_member
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
ESCAPED BY '"'
LINES TERMINATED BY '\n'
(name, age);