Are we to turn role of President into random social science experiment?

When the members of the Constitutional Convention considered the issue of the eligible age limit of candidates for the office of President of Ireland the membership was split 50:50 as to whether change was desirable but they did not specify an alternative age limit.
This ambivalent stance has now been transposed by the Government into a referendum proposal. But neither of the government parties have elaborated on what the underlying rationale for their proposal is and if there is any compelling evidence whatsoever to commend it for electoral support.