Right, apologies if I come across like a tosser here but here's the deal.
Wine is actually a hobby of mine which is a complete surprise to a lot as I don't come from that background. Was brought up in a very rough part of Glasgow and the only wine most of my family experienced was alter wine at church lol.
It is a hobby of mine that I have pursued as an adult as I like things I will NEVER know it all. Like woodworking.
I have put myself through professional qualifications at the WSET. Wine and Spirit Education Trust.
Wine only has true aging potential if it has certain qualities. In red wine high tannin content and high acidity. White wine has no tannin as the tannin comes from the skin of red grapes. Tannin is the thing that gives you that gum drying feeling like black tea does. Acid is felt on the side of your cheeks like a lemon draws your cheeks.
Grapes high in tannin like Cabernet Sauvignon (which most Bordeaux wines are predominately made of) are ripe for aging and actually too austere to drink young. They are hard work and not mellow. As time goes by the tannin mellows down and they become far more palatable. They still retain that freshness though where they still taste of fruit and juicy but yet have complex flavours going on in the background.
To cut a long story short, it is also the way the wine is made as Burgundy is exclusively made from Pinot Noir and that grape has a very thin skin and very little tannin. But it has a high acidity so can be aged like certain whites like Riesling, Chablis and wines from the Loire Valley etc......
The bottom line though is any wine in general bought from a major off sales or supermarket that is under a tenner is really a wine that should be drunk within 2 years if red or white and maybe a bit longer for a red.
Anything longer and the wine is on the downward spiral and although will not kill you or make you ill will not really taste that great. It won't have that fruitiness, acidity and taste bland and a bit vinegary.
It also has a lot to do with how you store it. Wine should not be kept in a kitchen in any shape or form if it's not going to be drunk in the space of a month or so. Nor an airing cupboard, garage or a room where there is a fireplace (real, electric or gas) as the temperature in these rooms fluctuates hourly (as us woodworkers know) and direct sunlight is the devil for wine.
Wine is fine in a dark, pretty constant temperature, quite room like under your stairs. Wine unlike Whisky which the minute it's bottled is "dead" IE it won't mature any more IE an 18 year old malt will always be an 18 year old malt, wine is a living breathing thing that changes in the bottle until it is drank.
My god I'm rambling lol. Bottom line is your under a tenner wine will be fine if you can stomach it but in no way will it be improved. If anything it will be quite harsh not the best thing you've ever drank.