Section 53

In computing years of age for the purposes of any written law, a person shall be regarded as having completed a year of age on the expiration of the day preceding the anniversary of his birth, reckoned according to the Gregorian calendar:

Provided that for the purposes of this section the anniversary of the birth of a person born on 29 February shall, in a year which is not a leap year, be taken as 1 March.

Interpretation 41