I don't see the relevance.
The relevance is, if a older man wishes to date a younger woman, and he is not married, not only is it okay, it is none of our honking business.
When I was 24, I was dating a 42 year old.
May/December romances are not morally objectionable, unless you are one of these busybody types who's got a freakin' opinion about EVERYthing someone else does.