Hair loss treatment

It's because hair doesn't grow back in the area where hair has fallen out, so they perform a hair transplant surgery.

So, does the area where the transplant surgery was performed only grow hair without falling out again?

Or is it about receiving a healthy hair follicle transplant that will grow back even if the hair falls out?

Hair transplant surgery is very expensive, and I'm curious if it's permanent. Also, the transplanted area is affected by aging.

I'm curious if natural hair loss is also unaffected.