It all starts as a teenager that falls in love with another, most people think it might just be puppy love, that's it's only temporary, and it wont last long because of this or that reason(s). Sometimes those people are right and sometimes those people are wrong but it all depends on the young couple, their individual character, personality, and statuses and how well they get along and stay and also be strong enough in a relationship no matter what happens and what life throws at them. Back in the times of B.C., A.D. and even now but in diverse countries have many cultures that will allow young marriages to go on such as China, Indonesian, and mainly India. Mostly at the early ages of nine to twelve years of age to be exact will be allowed and it's also a tradition to get married. In the United States of America it's total different. Even 18, 19, 20 yr old people and young adults up to 25 yrs of age will get denied in getting married at a young age no matter who they with, how long they've been together or how very well they are established they are. In my opinion, I can see if many teenagers and young adults are very well established like for example Miley Cyrus because they can supply they own needs such as a house, car, and etc and dont have to worry about money or asking anyone for money as long as they live, now in contrast I can see if they we're still living with their parents and/or guardians, don't have have or have a significant amount of money, and/or don't have a career, don't hardly know the person, cheating, doing it for other reasons, and still going to school(either high school or college) then that means very well they are not ready for marriage, and to include 9-12 year olds are highly unacceptable and ridiculous because they are just children.
It's no need for them to grow up so fast. The second thing I may add is many people especially parents say "it won't last long" because of this or that but mainly because we haven't experienced life which I don't hardly get what they're trying to say and how we haven't dated enough people, I guess some people haven't soak their wild oats yet and are very inmature, it doesn't make sense because how aren't we experiencing life and we're living it each day seeing the most unbelievable and outrageous things when we thought we seen it all. People can't say whether or not young marriages will survive or not because I know alot of people myself that got married in their teens and still married to the same person. Another opinion is that from 18-25 yrs of age we are all out of age completely. If you're old enough to buy lotto tickets and scratch offs, cigars, cigarettes, black and mild's, booze, go to liquor stores, clubs, casinos, get out on our own, get licenses, hang out all time of night without curfews and we even get trailed as an adult if we do something bad then I think it's okay to get married at a young age, it's according to us age has nothing to do with whether the marriage will last long or not as long as we share the same values, morals, and get married for the right reasons.