Not more than 3 years old because iPhone 6s was released fall 2015, and it could be only a few weeks because they are still available now. You might be able to get a better clue from the warranty checker, Check Your Service and Support Coverage - Apple Support
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Not more than 3 years old because iPhone 6s was released fall 2015, and it could be only a few weeks because they are still available now. You might be able to get a better clue from the warranty checker, Check Your Service and Support Coverage - Apple Support
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How old is my iPhone 6s Plus