From the FWIW column, I was in similar situation. Late 30's when I started therapy. Quite a bit of thinning. Took a couple years, but experienced very good re-growth. I have fine blond hair, also FWIW. Since the texture, and color certainly affect the overall result.
Now in my 50's, and pretty satisfied. I need highlights to sustain texture/thickness, but overall pretty happy.
Best of luck to you.