Good luck to them. I feel like I am a hundred and ninety at times, although, if you've seen some of my posts, you'd agree that mentally I am five. Love has no age limit.
Completely up to them, but it is a little yucky to me. I'm sure he must have money and she'll have a chance to have children at some point if she wants to. She knows she's unlikely to spend the rest of her life with him, but she obviously has a reason.
I think all you that say fatuous things like 'good Luck' and 'she looks happy' and generally make light of this, are missing the terrible obscenity of this young woman's predicament. She is obviously being forced into this sad situation by arrangement of others beyond her control.