Opinion on Pet Names

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Is being called/calling your significant other baby, babe, princess, babygirl, kitten, or any other names Immature?

Don’t get me wrong I like being called those things but when I look at older couples they call each other’s by their names.

Is that because they are more mature or that they don’t use them as a sign of affection like most teenagers do?

also i don’t know what topic to put this into so my bad if it’s wrong.