(1) This section applies to—
(a) a law in force in the ACT on, or at any time after, 1 November 1974; and
(b) an instrument (including a will or codicil) executed on or after that date.
(2) Subject to section 7 (2), the expressions "majority", "full age", sui juris , minor , "minority", infant , infancy , "nonage", and any similar expressions, when used in a law or instrument to which this section applies, are to be interpreted in accordance with section 5.
(3) Nothing in this Act affects a reference in a law or instrument to an age expressed in years.
(4) Nothing in this Act—
(a) affects the validity or operation of a settlement or disposition of property made before 1 November 1974; or
(b) affects the operation of any rule of law by which the validity or operation of such a settlement or disposition is to be determined.