This is a very timely topic in my case. I have very fair skin, and only ever had light blonde facial hair, with maybe a 10% distribution of darker ones on just the chin and lip.
For me, twenty years post and more than that on HRT, that facial hair has thinned out even more, but has never gone away. It hasn't been enough for me to bother too much with aside from a razor, but now that I'm recently unemployed, I'm biting the bullet, and allowing this mess to grow the requisite 1/8-1/4 inch length the electrologist I consulted with told me was needed to do manage the electrolysis session.
Here I sit in the local Starbucks, all these stealth years later, bristling whiskers and all, waiting to go for my first electrolysis session tomorrow. It's humbling indeed. I feel eyes boring into me from every direction.
Best of luck to you in finishing off those last stubborn folicles.