Child's orthodontic treatment

Is there an optimal timing for orthodontic treatment?

I'm curious whether it should be done when you're young or if it's something you can do as an adult.

There are various types of orthodontics, and sometimes teeth need to be extracted.

It seems like it takes a very long time and costs a lot.

I am curious about the approximate correction period and procedure.

Please let me know approximately how much the cost will be.