I really don't want to hurt any member's feelings and if anyone here is offended, my sincere apologies, but speaking about this particular case and my previous personal experience, relationships with such an age gap are not a mature choice for neither of the persons involved. I don't think she will be happy because we have seen her following this path for years now and, to me, it says that she has major issues she doesn't want to solve. As for his, of course he has issues too. I hope that especially Kitty, since she is so young, will find ways to not hurt herself but being simply content with her life.
I think you may be right, and there are other big differences too, like religion.
But who knows? Couples have surprised us before.
I didn't know about their different religions. Imo this is not a problem when none of them is super religious person and Kitty doesn't seem super religious so I believe they will be ok on this matter.
I do hope we will see the Spencer tiara!!!! I really wish her to be happy!