english question

I would put it as:
I think that you're now 14 and mature enough to be responsible to/for...

2008-09-09 09:11:29 補充：
As reminded: this is a proof reading question, and so one mistake exists. only one correction is accepted.

''i think that now YOUR 14 you are old enough to be responsible to .....''

試改作: (YOUR 變為 you're)

''i think that now you're 14 you are old enough to be responsible to .....''

你好! foreigner666hk

如果你要用 responsible for/ to, 後面必定要有一個對象∕一樣東西 (noun/ noun phrase/ noun clause)

2008-09-13 17:28:11 補充：
e.g.
1) ... old enough to be responsible for yourself. 為你自己負責任
2) ... old enough to be responsible for your behaviour. 為你自己的行為負責任
3) ... old enough to be responsible for what you have done. 為你自己所做的事負責任
4) ... old enough to be responsible to others. 向其他負責任

所以, grammatical mistake 係句子未完整。

"I think that now YOU'RE 14, you are old enough to be responsible FOR/ TO"

For or to depends what comes next.