Is Bad Posture Permanent?

photo by Eustaquio Santimano

Is bad posture permanent? Sometimes, but mostly no.
For the most part, bad posture is temporary and can be changed (How to Fix Bad Posture).
The more you wait, however, the tougher it will be to reverse the process.
What causes bad posture?
It can all be traced to

Injuries that lead to mechanically [...]