Inverted Nipples?

As one might guess, I look at a few pictures on the net but I find it interesting when I see a beautiful lady whose nipples are inverted.

From my own observations, it seems to be more common in the pics of younger ladies. As far the providers I have seen (who are usually 30+) I don't recall any having this "symptom" for lack of a better way to describe it.

Is this a common occurrence for ladies in general?

Just Curious,

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Related Inverted Nipple Boobiage Photo