I used to rely heavily on wine charts and Wine Spectator's judgement as to when things are ready to drink. But there are lots of issues with doing that. Among them, most wines really are made to be drunk now or very soon so the recommendations often cause one to overage most wines, age is highly dependent on storage conditions, and drinkability, like beauty, is in the eye of the beholder.
Anyway, these judgements are usually based on sampling the wines when they are very young if they are specific to the wine, and if they are general for the vintage and region like the linked chart above, they only apply to some mythical, median wine and not to any specific wine. The larger the region they apply to, the less likely it is that they are meaningful for a single wine...
Luckily, I found another source for such information. It does not work so well for obscure or less special wines, but it works more often and much better than not. There are myriad wine sites where people post tasting notes. So if you are curious about how a wine is drinking, go look for them and find some recent ones which will give you a specific idea about your wine's situation. It still does not take into account variations in storage conditions or the taste of the poster, but it is much more specific and better than a vintage chart or tasting from some years ago.
Wine Spectator online has lots of notes, but I find this site even better:
http://www.cellartracker.com/intro.asp (free subscription probably required). If those do not work for you, search for tasting notes and check out some other sites, or just do a search on your specific wine.
d
Feeling (south) loopy