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Are they all correct ?

A) She is the same age as me.

B) She is the same as I.

C) She is the same age as I am.

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B and C are grammatically correct. A lot of people say A, but it isn't grammatically correct.

Comments  
nicetomeetyou

Are they all correct ?

A) She is the same age as me. Not grammatical,but people spoke do say it in conversations, even natives.

B) She is the same as I (am).

C) She is the same age as I am.

To avoid saying it wrong," we are both the same age".