我八岁了用英语怎么说

1. I am eight years old. 我八岁了。

2. Today is my eighth birthday. 今天是我的八岁生日。

3. I have been on this earth for eight years. 我在这个地球上已经八年了。

4. It's been eight years since I was born. 自从我出生已经八年了。

5. I'm officially eight now. 我现在正式八岁了。