How young is too young to get married?

In the movie "The Princess Bride" (which, by the way, was a major inspiration for my book The Hidden Sun) there is a great scene where Buttercup and Prince Humperdinck are to be married. The "Impressive Clergyman" that performs the ceremony has one of the many memorable lines in the movie. It can be viewed below:Often my blogs are inspired by something I've seen or experienced which then leads my mind to ponder on the subject. For this blog, it came from a picture from a recent trip to a certain fast food restaurant.
The part that got my attention was the "3 - 12 years old can play. Parents too!" You could read this that if you were a parent between the ages of 3 and 12, you are allowed to play in the play area as well.
Granted, I do not know of any parents that are under the age of 12. However, my wife and I did get married at what many consider to be a very young age. I was 22, she was 19. In the part of the country where I grew up, this wasn't all that unusual. However, when I moved to Connecticut, I discovered how truly rare that was.
There were people that insisted that it would never work out between my wife and I. I'm happy to say that 19 years later, we are still going strong--but it wasn't by fate or dumb luck. It's taken a lot of hard work.
For five years we tried to have kids, but to no avail. Then our sweet Kelley came along and we were delighted! 18 months later, beautiful Emily joined our family. Another 18 months after that, and our darling redhead Amy came along, and now my wife and I were outnumbered. At times, it felt like we had triplets. It took 3 more years before our creative, silly Stephanie completed our family.
Stephanie just turned 8. It's almost hard to believe. But as my wife and I talk (which we do often) we've realized something. The only way our marriage has survived for this long is because both of us are dedicated to it 100%. In addition, we are always communicating about our dreams, goals, concerns and such. If there is something bothering one of us, the other is there to support and help them.
Now, this isn't to say that I believe all marriages will work out. As I stated above, I believe both people have to be 100% dedicated to the happiness of the other person. A successful marriage can't be held together by one person.
Also, I don't believe that everyone will find their spouse in their early twenties. And if it is later in life that you find your spouse, that doesn't mean there was anything wrong with you. Some things are worth the wait.
I, personally, have been blessed with a wonderful wife who forgives me of my shortcomings. She makes me want to be a better person. At the same time, I want to her be happy, which means I can't be selfish, and I must give up some of my freedom to do so. However, the rewards for doing so totally outweigh any perceived freedom I've surrendered.