Dementia is not a hard diagnosis, rather its subjective and factors based. Then again, you don't spend all day around these people and have any clue.
You're wrong, Doctor. My father presently suffers from dementia. My grandmother suffered thirteen years with it; an uncle and two aunts died in the past two years, and another aunt has it.
There is no reason to jump to the conclusion that Sterling has it (in any of its forms)when you don't know him and your knowledge is limited to what was presented through media.
