导读：
Mysonhasturnedthirteenandisnowateenager.我儿子已经13岁了。...
1. He is thirteen years old. 他13岁了。
My little brother is finally thirteen years old!他的弟弟终于13岁了！2. He has turned thirteen. 他已经13岁了。
My son has turned thirteen and is now a teenager.我儿子已经13岁了，现在是个青少年了。3. He is now a teenager. 他现在是个青少年了。
My nephew is now a teenager at thirteen years old.我侄子现在已经13岁了，成为了一个青少年。4. He is in his thirteenth year. 他正在13岁这一年。
My daughter is currently in her thirteenth year and will turn fourteen soon.我女儿现在正在13岁这一年，很快就要14岁了。5. He is a thirteen-year-old. 他是一个13岁的孩子。
The new kid in class is a thirteen-year-old from California.班上的新同学是一个来自加利福尼亚州的13岁孩子。 
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