Maybe I am looking at it from a naive way, but I am 19 years old, and got married 3 weeks ago, to a man who is 7 years my elder. We had been engaged for 18 months (just after my 18th Birthday) and he asked my dad if he could marry me (to which he said yes)
He saved up for a diamond ring from an antique shop, and my wedding ring is my great grandmothers ring.
My parents are very traditional and paid for the wedding (for the exceptions for which is paid by the groom, like the rings, ceremony, etc.)
And me and my husband have a flat together (which is my parents and we rent it off them, and we have done it up ourselves)
I believe however, yes we are young, but it depends on how you go into a marriage, whether you do it light-hearted and on a whim. Thinking of the big day and the party, or the people who look forward, want the future together, and are genuinely compatible.
All of the women in my family married under the age of 21, so my age is nothing unusual.
We are happy, and intend to stay together for a long time. I think that is enough.