아줌마's hair perm

Have you ever seen 아줌마's hair perm in Korea?
We can see that in the center of the Metropolis and countryside.
Why do 아줌마 have a perm?
First of all, it seems neat!
And that style takes long time.
If hair shop is located in neighborhood, the price is so cheap.
Granny do same hair style.
Why do they have that?