It is not unlawful for a person to discriminate on the basis of age or impairment by imposing a superannuation fund condition after the commencement of section 53 in relation to another person, irrespective of—
(a) whether the superannuation fund was in existence before the commencement of section 53 ; and
(b) when the other person became, or becomes, a member of the fund;if—
(c) the condition is based on reasonable actuarial or statistical data from a source on which it is reasonable for the person to rely; and
(d) the condition is reasonable having regard to the data and any other relevant factors.