常見句型：
1、We're only fifteen years old and kindred spirits.
我們才十五歲而且有著年輕的心態。
2、Although he is only fifteen years old, he looks very mature.
雖然他只有十五歲，但是看起來很成熟。
3、She was fifteen years old when she accompanied her brother on this adventure.
艾米加入哥哥此次冒險旅程的時候，年僅十五歲。