Im the same age as you and have been using for the same amount of time - I also experience this. Its a normal side effect of minoxidil. No they arent permanent hairs, they will most likely stop growing if you stop minoxidil. I'd recommend continuing minoxidil and also using a dermaroller at 1.5mm once every week. You should see much better results. just shave those weird stray eyebrow hairs if you have to. its worth it.