Here is a great post at Femina about marring young. I posted a comment and Natalie linked to it, so I thought I might share my thoughts here too. Here is my comment:
My husband and I were 19 and 20 when we got married and I am so glad we did. We have grown up together!
My husband addressed this topic recently and mentioned objection #1 (financial issues). He said that some parents would rather their child struggle with sexual temptation than have any financial struggles. While we both agree that there needs to be a plan financially, it is not the end of the world to have to work hard to make ends meet. I would rather be frugal together than struggle with sexual temptation while trying to wait for cushy finances.