wine aging (thing)
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I've seen it happen far too many times; well-meaning but naive wine customer buys the oldest bottle of [red] she finds on the shelf, keeps it in her basement for a couple years, and cracks it open at that "special" occasion only to find it's turned to a brown, sour, nasty liquid, fit more for drizzling over a [salad] than washing down a perfectly grilled [porterhouse].
Stupid Wine, she thinks, It Must Be [Corked], and proceeds to haul it back to the wine store, several years after purchase, and angrily demand a refund for the embarrassment suffered, at which point it is now My Problem and frankly I've got enough on my plate as it is.
It certainly doesn't help that the popular conception of wine out there, especially [red wine], is: the older the better. The irony is that, the very fact that wine today is so popular is why winemakers churn out millions of bottles of fresh, young, fruity wine that's ready to drink now and not even remotely [shelf stable] - whilst simultaneously selling the classy, refined notion of aged wine with fine cuisine. It's classic [bait-and-switch] marketing. 95% of all the wine on store shelves will not last 5 years past its vintage date. So today you're going to learn about how wine ages; how exactly it changes and why, which wines [Cabernet Sauvignon|age] and which [malbec|don't], and how to be a [savvy] consumer and not get ripped off like [The Fabulous Furry Freak Brothers|Fat Freddy trying to score a lid], cause honestly if I get one more ill-informed customer with deep pockets and a [reputation to uphold] I'm going to snap. So make sure it's not you.
(It should be noted that with wine, the exception is often the rule; hence some wines, [Madeira] in particular, are intentionally oxidized, a process called [maderization].)
So with that in mind, I will list the three main characteristics of a wine that promote longevity, or to put it another way, the characteristics that prevent excess oxidation*. Typically for a wine to age at all it must contain two of the three, and for the real long-lived brutes, your [1948 Chateau Petrus]es and [Barolo]s, it's all three or bust.
Typically present in greater quantities in [white wine], acid is that puckery quality that promotes salivation and so is technically considered, along with [alcohol], a [softening agent] in wines. Heat, sunlight, and ripeness all determine the acid level of a wine, so a general rule is that [cool climate] grapes, like [Riesling] and [Sauvignon Blanc], will generally be higher in acid than, say, [Chardonnay] or [Muscat], white wines that thrive in warm, sunny climes. For a winemaker, getting the acid levels right is crucial, and a delay in harvesting of even a couple days can make the difference between stellar wine and [table wine]. Too much acid, and the wine is green and unpalatable; but wait a little too long, and an overripe grape will be flat and one-dimensional. [Pinot Grigio] is notoriously difficult to judge in this area, as it ripens late but is fragile, and so is susceptible to [early frost] and [rot].
The red grapes that are highest in acid, [Cabernet Sauvignon] and [Nebbiolo] (which produces [Barolo]), typically make the wines able to age the longest. Though white wines are plentiful in this regard, they often lack the next two qualities making them unsuitable for long-term aging. A good rule with white wines (in particular [Sauvignon Blanc], [Pinot Grigio], and [Gewurztraminer]) is to drink them within three years of the vintage date. Any more and you're playing with fire, though there are [Riesling|exceptions], which I will get to below.
Grapes that are high in acid: Cabernet Sauvignon, Nebbiolo, Riesling, [Gewurztraminer], [Chenin Blanc], [Sangiovese], Sauvignon Blanc.
Present in the skins, seeds and stems (called [must]) of grapes, [Tannin]s are exclusively found in red wines, due to the fact that the juice is allowed to ferment with the must as opposed to white wines where the juice is removed. (A common misconception is that white wine grapes are actually white; [Pinot Grigio] grapes, for example, can often be a bright purple colour). [Rose wines], as you may have surmised, achieve their colour by only limited contact with the must - hence "white" zinfandel. Ripeness and skin thickness are typically the determining factors for how tannic a wine will be; [nebbiolo] is a very late ripening red grape and so must be harvested somewhat [unripe] to prevent frost and vine rot, despite the searing tannin and acidity levels that result. [Pinot Noir], on the other hand, though being another late-ripener, has very thin skin and so is not particularly tannic (save for those grown in the village of [Pommard] in [Burgundy], for reasons yet unknown).
Not all red wine contains tannin. [Beaujolais], for example, is almost devoid of tannins due to its [anaerobic] fermentation process (called [carbonic maceration]). [Valpolicella], a light, summery Italian red, is the same way. The popular reds [Merlot], [Shiraz]/[Syrah] and [Zinfandel] all contain moderate amounts of tannin.
Brief Aside: What the fuck is a tannin anyway? By far one of the most bandied-about and least-understood terms in wine is [tannin]. The number of people who use the term while having not the remotest clue of what it means is staggering. Tannins are hydrophobic phenolic compounds which dry up saliva in the mouth, leaving a pronounced [cottonmouth] sensation. The more tannic a wine is, the drier it is, and forms a counterbalance to acid. When a wine is described as being "well-structured", this is what they mean. To experience it directly, pour yourself a glass of [Valpolicella] next to a glass of [Cabernet Sauvignon]. Taste the difference. That difference is [tannin].
Anyways. As red wine ages, the tannin molecules present inevitably smash together, which causes them to fuse. When they get big enough, they fall to the bottom of the bottle as [sediment]. This is why so much value is placed on aging - as more tannins are converted to sediment, the remaining wine becomes much softer, intensely fruity, and elegant, without sacrificing body or acid. After all, you could produce a soft, fruity wine by harvesting late and reducing pruning, but it would be thin. That's why [Barolo], containing the savagely dry [nebbiolo] grape should only be drank a minimum of ten years after the vintage date. Any earlier than five years it's literally undrinkable, because it takes that long for enough tannin molecules to collide together and fall as sediment.
Grapes that are high in tannin, from most to least: Nebbiolo, Cabernet Sauvignon, Syrah, Zinfandel, Merlot, Malbec, Tempranillo, Pinot Noir, Sangiovese, Barbera, Valpolicella (actually [Corvina] and [Rondinella] grapes), Beaujolais (actually called [Gamay]).
Also called [fruit concentration], extract refers to how many fermentable solids, such as pulp, are present in a grape. This is why most vines are aggressively [pruned] and [trellised]; the less fruit a vine produces, the more concentrated and hence flavourful it will be. It's also why, rather counter-intuitively, vines are often planted on poor, gravelly, chalky soil; the prevailing notion, developed over millennia of winemaking, is that a vine must struggle to produce fruit - a pampered vine growing in rich topsoil will get lazy and produce less-than-stellar grapes.
High-extract grapes produce highly alcoholic wines, which help guard against oxidation, as well as full-bodied, broad-shouldered wines which fill the mouth and linger for seemingly [eons]. [Zinfandel] is perhaps the best example of this, producing wines often in excess of 15% [Alcohol by volume|ABV] and presenting a very rich, blackberry-infused palate, though white wines such as [Muscat], [Riesling] and [Chardonnay] also exhibit the same qualities. Extract levels are usually more influenced by the intrinsic qualities of a grape and less by environmental considerations.
High-extract grapes: Nebbiolo, Cabernet Sauvignon, Muscat, Riesling, Zinfandel, Tempranillo, [Viognier], [Tokay]
There are about a million other things that influence to varying degrees the shelf life of a wine - vinification practices, type of oak used for aging, whether or not [sulfites] are added, what time of day the fruit was harvested, how it's stored, how much sunlight the bottle is exposed to, ambient temperature, the [zodiac] sign of the purchaser, you name it. The idea here was simply to present the primary factors in aging. Truthfully, you could devote a lifetime to [oenology] and still not be 100% sure. Winemaking is, after all, as much art as science.
The importance of proper [cellaring] cannot be overestimated. All wine, if not meant to be drank within a few months, should be stored lying on its side in a cool, dark place. Why on its side? It keeps the cork moist and the liquid provides a better airtight seal.
Sulfur compounds, particularly [sulfur dioxide], are used by winemakers at various stages of the [vinification] process as a preservative. It's a misconception that red wines have the most sulfites; in reality, the reverse is true, with most white table wines containing three to four times (+/- 150 ppm) as many sulfites as your average red. This is because white wines typically have a shorter shelf life than reds, which is the primary purpose of adding sulfites. So you can't blame sulfites for your [red wine headaches]. Fortified wines, with their large amount of unconverted sugars, have by far the highest sulfite levels with some going as high as 450 ppm.
Virtually every bottle of wine has on it, somewhere, the words "contains sulfites". That's because the legal threshold in the [United States] requiring such a statement is a miniscule 10ppm, even though studies have shown that the threshold for sulfite-related reactions starts at roughly 200 ppm. Basically all grapes have that many naturally occurring sulfur compounds even if nothing extra was added (such as with [organic] wine), so the label "contains sulfites" is not particularly instructive. Some winemakers have started adding "no added sulfites" to their label, which is at least a little clearer.
Ok. Here are the most commonly found wines for sale, in descending order of longevity from vintage year (standard disclaimer applies).
Most popular wines today, white and red, suffer from the same problem; [overproduction]. Casual wine drinkers prefer soft, light, fruity wines that don't demand a lot of attention, and so winemakers scramble to fit the bill. This means late-harvested, high-yield grapes aged in concrete or stainless steel vats, which gets the flavour profile people like but also makes the wines very short-lived. To shorten the maturation process, many winemakers age red wines in vats full of [oak chips], imparting the qualities of oaking at a fraction of the time or price of doing it in proper casks. [Pinotage], the in-grape of [South Africa], is highly susceptible to rot and so is aged in extremely charred oak chips to mask the flavour of spoilt grapes. Wine producers then turn around and market it as tasting like [mocha]. Which it most certainly does.
Wine is absolutely amazing, and can offer a lifetime of decadent enjoyment. There's nothing wrong with approaching it with an open mind an a willingness to learn, and indeed it's only by drinking wine, lots of it, that the learning process happens. What's important, though, is to be humble - the more you learn about wine, the more you realize just how absolutely [infinitesimal] your knowledge of it really is.
So don't make an ass of yourself at the wine store.
*Disclaimer: The nature of wine is such that there are always exceptions, special circumstances, and one-offs that prove counter to any "rule". What's written above is simply a general summary of how wine aging works - you could write a [War and Peace]-sized dissertation of the process and still just scratch the surface. So don't /msg me about how such-and-such grape grown in such-and-such place actually works differently from what I said, because you're probably right, so go pat yourself on the back now.