Well where I come from they say: don't wrap your head before you've broken it.
According to our current knowledge, dementia is not hereditary but sporadic, so it is not said that if a parent or relative has had dementia, their children will have it.
However everything I know faces and you are not a person who escapes battles, this in general, so yes, whatever the case in the future everything will be fine.
It'll all work out, and eventually I'll die and it won't matter. In the meantime I live each day as best I can and have a pretty good life. No real complaints.