如何用英语说:我已经年满20岁了!!!

I have already reached 20 years old.

你把这个想的太复杂了，就是I'm 20.

I have been 20 years old.

I'm age 20 now.

Im 20 years old now.

I'm already 20 years old.

i live in this planet for 20 years already.

This is my 20th year in earth.

I will be 21 years old next year.

I'm twenty years old.

I'M OVER 20!