As with most things, the answer is complicated: each one is different. I think 'Blackheart' has an anticipated maturity date of 2015-2020 or so printed on the bottle, if I recall correctly. Almost all of our meads will age very very well. We go from start to bottling in about 3.5 months (on average), but since we use whole ingredients in most of our primary fermentations there is a lot of nutrient and pH buffer for yeast growth and metabolic activity. This contributes to our meads being very drinkable out of the gate; however, we also choose fruits and honeys that are pretty acidic (think raspberries, for example) and this acidity can contribute to a wine's ability to age for 20 years or more. We make our meads at 14% abv and use a super or first grade natural cork in every bottle, so our mead has the capability to be aged for this length of time (or more), something that absolutely cannot be said for meads or wines that use agglomerated corks, synthetic corks, bar-top corks or similar. These meads are not intended for long-term aging, as they will experience premature oxidation as the years go by and the closure degrades.
Additionally, we don't use chemical preservatives like sorbates (which can very quickly turn a wine into something undrinkable, with notes of celery and geraniums). Many popular meaderies use way too much sulfite and sorbate in their meads, and this is something most mead fans need to educate themselves about in terms of the aging potential of these meads (because they're definitely not going to point this out to you). Excessive sulfite can also give you hardcore flatulence (I'm not kidding, look it up). We use sanitary winemaking techniques and an alcohol concentration above 12% to create what is really a natural mead, free of artificial crap.
There is a difference in acidity between some of our meads (think 'Peach' vs. 'Black Agnes' vs. 'Black Heart'), and some of these might age differently. Like many fine wines, it can be difficult to say when each mead will reach its 'peak', and this is something that we will have to learn together by trial and error. Most red wines (even at the very low end of the spectrum) reach the consumer after a few years. Many people with a lot of craft beer experience (and not a lot of wine background) are surprised to find that one or more of our meads won't be drinking at its 'peak' immediately after it is released (e.g. Black Heart batch #1). However, there are a few things that can give us some clues as to when or if a mead will improve drastically with aging. Believe it or not, both 'Black Agnes' batches are not drinking at their peak just yet. Black currants are LOADED with complex acidity and this is why the sweetness of this mead is so high to balance the mead (it's the sweetest mead we make). However, these two attributes combined (in the correct ratio) can give a wine the ability to age for a very long time.