我三十歲。

I'm thirty.

I'm thirty years old.

I am thirty.

I am thirty years old.

I'm 30 years old.

I am 30 years old.

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
2 三十 sānshí
  1. thirty
  2. 30
3 歲 suì
  1. classifier for years (of age)
  2. year
  3. year (of crop harvests)