参考答案:

When I was 5 everyone told me to be a big boy.
When I was 10 they told me I should be more mature.
Now they say it's time to start acting like an adult.
At this rate, I'll be eligible for social security before I graduate from high school.
当我5岁的时候，每个人都告诉我要去做一个大男孩。
当我10岁的时候，他们告诉我我必须变得更成熟些。
现在他们说是时候开始像个成年人了。
若是以这种速度的话，在我高中毕业之前我就可以做个社会保安人员了。