Hang in there @themarkymark.
I come from a family that unfortunately has severe demencia running on both sides - so chances are I will develop some form of it eventually.
I have seen all my grandparents slowly fading - getting progressively lost, from the point of challenging that they are not confused, to the point where they seem to relive their teenage years - I've been on the shoes of my grandmother's "boyfriend" a few times - up to the time where it completely fades into an existence of relative void and peace.
That's the only solace we can take from it - at least they will go without realizing much of what's happening to them, in peace.
It gets to a point where it is no longer worth it correcting them. To tell them their husband passed away and seeing them re-living what was probably one of the worst days of their lives again and again.
We've just ended up accepting their fate - what is, is deffinitily no longer what it was. And we provide them with whatever confort you can give them, to relieve their stress and nerves. It is not worth it anymore to fight every battle and to curate every thought of theirs.
I am starting to see the early signs of its onset on my parents, even sooner than on my grandparents - and it terrifies me a bit - but it is the fate that is sealed in our genes.
Just hang on in there and, as you say, try to make the most of your time and days. I'll do the same on my end.