13. It shall be lawful for the President to require any officer to retire from the public service in Singapore —
who has attained, in the case of a male officer in the public service in Singapore on 1st July 1956, the age of 55 years, and in the case of any other male officer the age of 60 years or 55 years if the President in any individual case so directs;
who, being a police officer below the rank of assistant superintendent or a prison officer below the rank of superintendent, has attained the age of 45 years;
whose retirement appears to the President to be desirable in the public interest;
who, being a woman appointed to the public service before 1st March 1962, is married or marries and has opted to remain eligible for a gratuity on marriage;
on the abolition of his office;
for the purpose of facilitating improvement in the organisation of the department to which he belongs by which greater efficiency or economy may be effected; or
who has attained, in the case of a female officer appointed to the public service on or after 1st March 1962, the age of 60 years or 55 years if the President in any individual case so directs.