Функция plpgsql с курсором

CREATE OR REPLACE FUNCTION procedure_cursor() RETURNS VOID AS $$
DECLARE
    ref_cursor REFCURSOR;
    name TEXT;
    age INTEGER;
BEGIN
    OPEN ref_cursor FOR SELECT * FROM customers;
    LOOP
        FETCH ref_cursor INTO name, age;
        EXIT WHEN NOT FOUND;
        RAISE NOTICE '%', name;
        RAISE NOTICE '%', age;
    END LOOP;
    CLOSE ref_cursor;
END;
$$ LANGUAGE plpgsql;