multilingual expression and dementia

Are you multilingual? congratulations, you delayed the unset of dementia. Now it will be interesting to check if what I said about being a musician equalling being multilingual is true. In which case being deaf might at least delay dementia. What does this mean for schools? It might mean that the policy of starting to learn languages (and maybe mathematical language) at an early age might have a positive health result.
Now what was I saying?