Honestly, yes. The reason though is because at such a young age, the ability to make very rational and logical decisions is still developing.
"Love" may seem real, but the definition of love changes througout the relationship's life. Love is usually associated by feelings by most people, but older, wiser people will tell you that it's the ability to be patient and compromise. Because one day, those "love" feelings will change into comfortable feelings. That's why you have so many people that "fall out of love."
It's not that they have fallen out of love, it's that they have lost the euphoria feelings that occur in the beginning of a relationship.
If the young couple can truly and logically say that they will do everything they can to make a relationship work, then I say go for it! However, unfortunately, with most people this is not the case. Sure, they may say they will stick together through thick and thin, but when the time arises, their "love" just won't hold up under the pressures of life.