@clive Knowledge about brain damage is limited at this time. My son has congenital brain damage, but over the years had a semi-normal life and far more abilities than expected. Then over time, many neurosurgeries. Over decades more than a few falls with concussion. Now at almost 45, he has ALSO acquired early-onset Alzheimer's and an unknown mixed dementia. Yet he continues to function with support. Now whatever happens, who knows the cause. Go research!