he is dismissed (except by reasons of redundancy or summary dismissal due to the employee’s serious misconduct); ( 2 )his fixed term employment contract expires without being renewed; ( 3 )he dies during employment; ( 4 )he has been issued a certificate in a specified form by a registered medical practitioner or a registered Chinese medicine practitioner, certifying that he is permanently unfit for his present job and he resigns; or ( 5 )he is aged 65 or above and resigns on ground of old age.