Grown adults saying 2010-2020 was 10 years ago is not the same as a 5 year old saying 2005 was 10 years ago.

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When a 5 year old says 2005 was 10 years ago their actually wrong because in reality it was 2010, but when a 20 year old says 2010-2020 was literally 10 years ago they are right.