Everyone has me but nobody can lose me. What am I?

Common Wrong Answers
“A name”
While everyone has a name, it is possible for someone to change or lose their name, making it not a permanent aspect of identity.
“A friend”
People can gain or lose friends throughout their lives, so a friend is not something that everyone has permanently.
“A heartbeat”
Although everyone has a heartbeat, it is possible for someone to lose it due to medical conditions, so it does not fit the criteria of being something nobody can lose.
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