Complete the following sentence by using a question tag:I am older th…

The correct answer is Option (3) → aren't I?

Question tag after "I am":

• Rule: a positive statement takes a negative tag, made of the helping verb + not and a pronoun for the subject.
• The subject here is I, so the pronoun in the tag must be I.
• "Amn't I" is not standard English and the formal "am I not?" is rare in everyday use, so the usual negative tag for "I am" is aren't I?
• Complete sentence: I am older than you, aren't I?

Why the Other Options are Incorrect?

Option 1: aren't you? — Incorrect. The tag must repeat the subject "I", not "you". "You" is only the person compared.

Option 2: aren't we? — Incorrect. "We" is plural and does not stand for the subject "I".

Option 4: can't I? — Incorrect. The statement has the verb am, not "can". The tag must use the same verb.

Contrast: "I am" takes aren't I? Other subjects repeat their own pronoun (You are older, aren't you?).