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It dates from an old tradition that at 21 years old, you were considered old enough to be a keyholder to your family home, and thus hold a symbolically 'senior' position in the family. It's an old tradition that has long since become irrelevant and obsolete, but the symbolism of the key on the 21st birthday lives on.
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Earn +20 ptsQ: Why do you get a key on your 21st birthday?
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