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That one I didn't know. I wonder if the added neural pathways formed from mastering more than one language just delay the onset period for dementia ( and then we don't live long enough to see it ) or if they actually change the physical structuring of the brain allowing for better oxygenation. ( A lot of non-Alzheimer's dementia is caused by poor blood flow in the brain ).

yes of course good old vascular dementia you are correct, however i should have been more specific in saying that i was referring to alzeimers dementia. I believe the thinking is, the more connections there are the more connections there are to break, it is a similar picture with those who are better educated.

That is another good angle and point.