Yes. You're probably the 4th person I've seen here other than me say that changes to the brow area were the first observable change.  My brows were always straight-to-droopy shaped, with no noticeable browbone. I now have a distinct brow arch. I'm 40, and it developed in only about a month.

@elevee That interesting to hear. My case seems to me to be a matter of change in muscle posture rather than bone remodeling. It's like when you stand up straight and you suddenly look more alert, but now applied to my face(tongue posture = alert eye section). But you are talking about change in your bones. That is remarkable, considering the time it took, in hand with your age. Do you have an explanation for your case?

I really don't, and I haven't seen the matter of eyebrows explored outside this forum. The one other poster I remember for sure saying something about it was @darkindigo, who I think is also a female over 30. We were both commenting on the thread of a teenage male who was struggling with how *fast* his brows were changing. I'm sure if you searched the words eyebrows and fast, you'd find it!

My one real guess is that the brows may be "low hanging fruit", so to speak. Maybe there's some reason why brows remodel faster (do they have a higher cell regeneration rate, like the lips?) or a certain evolutionary drive to model well (to protect the eye?) that kicks in as soon as you remove a postural barrier. I have no idea.