What can you do with "old" wine. No, not cellared reds but cheap, forgotten whites?
Fortify them.
Ooohhh. Fortify. That's sounds encouraging.
And easy.
Just listen to this UNinformed Guide and you will be able to fortify to your heart's content.
Of course, this guide is mostly unresearched and alcohol consumption is up to you. No advice there.
So save money by using up your old wine. (Although you will need to spend a small fortune on herbs and spices)
Enjoy.