Wine sediments

[Kayden]

I have a 1979 Wollsteiner Rheingrafenstein Kabinett that I have been storing for years. Two questions:

1.Is this wine worth continuing to store or is it going to taste like vinager when I open it? (it has always been stored in dark/cool/on side etc.).

2. There are sediments that have "built up" on the bottom (side) of the bottle during storing periods. Should I not disturb the sediments? Would shaking the bottle not be good for the wine?

Thanks
K