Since 1990, the divorce rate for Americans 50 and older has doubled, even as the overall divorce rate has fallen. But despite the bleak statistics, successful longtime marriages aren't entirely obsolete. And we have the pictures to prove it.

Over the past week, we reached out to our followers on Facebook who've been married a long, long time. We asked couples to send us a photo of them when they were first together and one from the present. Scroll down and see images of 19 beautiful couples -- as well as their advice for maintaining a happy marriage.

The secret for one couple is to just keep talking; for another it's the ability to make each other laugh. Have anything to add? Please do so in comments. Happy Valentine's Day!