In this structure in English, you can use either an object pronoun or a subject pronoun plus a verb. You can't use a subject pronoun without a verb. "She is taller than me." OR "She is taller than I am." BUT NOT "She is taller than I."
Actually, both versions "taller than I" and "taller than me" are correct English grammar, even though the first one is not often used in everyday speech.https://www.writing-skills.com/is-it-taller-than-i-or-taller-than-me
See the textbook English Grammar in Use (published by Cambridge) Unit 107, section D.
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