That "un" makes it seem to be sort of a part of a personal profile. "Añitos" can imply many things in that context and give dozens of nuances in different contexts. For instance, a party girl can say "18 añitos" to say "age, but Lolita like"; other person can say "18 añitos" because his or her birthday was last week -they are "new 18"-. The range can be pretty wide and wild.
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