My husband and I celebrated our 10th wedding anniversary last week. I can't believe that so much time has gone by. We are high school sweethearts (yes...some really do stick together), so we've been together for 19 years in total--basically we've spent our entire adult lives together. Even though things are a bit (a lot) different from our carefree high school years (two kids, a house, and car loans have a way of changing things), I can honestly say that we are still very much in love--a fact which definitely helps when writing romance.
Mind you, it's different from that rush of new love, which is all stomach flutters and sweaty palms. But I think it's better. It's knowing that you can count on someone to be there for you, someone who'll listen to you complain, someone who'll still find you sexy when you're wearing your most comfortable (read ugly) night gown.
I wouldn't change a thing.