Chonbon,
There are 2 main parts to your question -
one is age, the other is drinking.
We generally have age limits on things which we don't think young people can handle responsibly. This is reasonable. Most of us don't want to turn a 10-year-old loose with an assault rifle, a driver's license, alcohol, etc.
As far as alcohol goes, there are a lot of verses about it in the bible, and there is some study you could do. Good decent Christians do have disagreements about it, but there are still a lot of verses that are pretty clear to everyone. It says pretty clearly not to get drunk and loose control of yourself. I think that is pretty well understood and indisputable. In general, if you have questions about alcohol, this would be a good time to start studying all the verses in the bible on the subject, and see what it says.
God Bless
Max