(1) Where a person has, on or before the day on which he attained or would have attained the age of 21 years, ceased to be an employee by reason of retirement on the ground of invalidity or by reason of death, and pension is payable to or in respect of him, the Commissioner for Superannuation may, in writing, authorize the pension to be increased to such extent as the Commissioner, in accordance with principles approved by the Minister for the purposes of this section, determines.
(2) An increase in pension authorized by the Commissioner for Superannuation under subsection (1) applies in relation to the instalment of pension falling due on such day as the Commissioner determines (not being a day earlier than 1 July 1976) and in relation to all subsequent instalments.