minimus, you made a good point when you said that marriage is a huge decision, and one wouldn't expect one to enter into that at such a young age. If a 12 year old said he/she wanted to get married, that they were mature enough, a parent would obviously say no. Yet they have no problem allowing a young child to get baptized, when they themselves say that dedication and baptism is the MOST important decision one can ever make. Lets see, a child can dedicate the rest of their lives to an earthly organization, but can't make a decision about who he can hang out with. Makes no sense.
I got baptised at 15, because I wanted to please my mom and make the elders believe I was a good kid. My dad ( who wasn't a witness ) called me on the phone and said it was the worst decision I could ever make ( I got so mad I hung up on him ). For once, my dad was right about something.