Lovely to hear such a happy story. Good wishes to you all.
I use girlfriend but I'm only 23 so I feel fine with it. Though I like to refer to my partners anytime I can, but when I'm talking about one of them I feel that I need some term that distinguishes whom I'm talking about. So that's when I use husband or girlfriend (although I prefer to just use their names, so I always do that when that can be done). Sorry I don't have any amazing suggestions.