

If they’re even remotely like us, then they’ll have the same sort of story, which will entail multiple languages.
That is: To assume that a sapient, language-capable genus evolves in one place, then spreads across a planet from there.
Even if they all speak the same language when they begin the spread, the same sorts of factors will encourage semantic drift in different ways in different places, and over enough time, multiple languages are all-but inevitable.



According to the legislation, the concepts of “user” and “18 and over” are mutually exclusive. Anyone over 18 is “an account holder”.
The most charitable reason I can think of that they would do this is that short phrases like “minor user”, that would otherwise be far better choices, have an unwanted secondary reading that the creators of the law sought to avoid (that being “user of minors”), and they wished to keep things more terse than repeated use of the phrase “user under the age of 18”.
I don’t think that’s a good enough excuse to blatantly redefine a well-established term, even if the scope of the redefinition is limited. Even if there’s precedent for having done similarly in the past.
And it’s all but guaranteed that someone will attempt to leverage that redefinition outside of the scope.