47. For the purposes of computations under the second paragraph of section 42 and sections 44 to 46, the indexing provided for in section 25 shall be determined by indexing the initial amount according to the rate of indexation determined for each period under the Government and Public Employees Retirement Plan from the date on which the amount would have become payable.
In that case, the reduction prescribed in section 24 applies, if the payable pension is guaranteed under subparagraph a of the first paragraph of section 18 of the Act respecting pension coverage for certain teachers (chapter P-32.1), from the month immediately following the pensioner’s sixty-fifth birthday, even if he died before that age.