“Most recent brain research has found that the brain is a lot less localized than we previously thought. That is, a specific piece of information (i.e., your grandmother’s face) does not reside in a precise location in the brain, but may involve tens of thousands of different small processing sites throughout the brainstem and cortex,” says Dr. Brown.
This is one of those things that's just a common misconception.
Like, there are specific areas of the brain that almost always do the same thing. But human variation is a big deal, especially with the brain.
Science has known conclusively for like 50 years that any area of the brain can do any task. If your born without "the language center" another part of your brain will likely get co opted to process language.
Even if the corpus callosum is separated as a teen, the other hemisphere will likely develop it's own language center.
Late 20s or older and you're likely stuck with half your brain not being able to vocally communicate.
But most people never learn about stuff that in depth, but think what was covered in highschool science was all the science there is. It's not, you're just getting the generic "most of the time" answers.