Retracted.

I have had similar experience. When I was young I had blond hair. When I got older it turned dirty blonde/light brown. My eybrows followed suit. Now they are starting to head the other way. The same goes for all my facial hair. Unfortunitialy that means I need more electrolisis now and not so much laser. 

<3 Liv

Both my eyebrows and hair color have gotten much lighter & more blonde on HRT. The hair is really different. HRT can do strange things.

Not only my relatively dark eyebrows went transparant, my eyelashes too! 

It 'makes sense' though; older cismen develop thick, long, bushy eyebrows...so being on estrogen turns the effect the other way 🙁