(1)  For all the purposes of the laws of the State, the time at which a person attains a particular age expressed in years is the commencement of the relevant anniversary of the date of his birth.

(2)  This section –

(a) has effect only where the relevant anniversary falls on the appointed day or on a subsequent day; and

(b) has effect, in relation to an enactment or instrument, subject to any provision contained in the enactment or instrument.