Nope.
There is no hard and fast answer to your question. First of all, find a resource that has guidelines for a given region's harvest and shipping schedule. Indonesian coffees come in a different times than Central Americans which can be different than Africans. There's also the variable of when a coffee was harvested in its own cycle; early harvest, mid or late harvest. It could have been harvested several months before your broker/importer received it.
If stored properly, green coffee will still be in its prime for at least a year. And realize that it doesn't just fall of a cliff in terms of flavor and nuance. Coffee at two years past harvest, stored properly might be a little off, but unless you had it a few times during that period you may never know that it's two years old.
So I wouldn't be real concerned about it. Just be aware, for example, that new crop Centrals will be rolling in in a couple months. That's not to say that the new crop will be any better than last year's, but if the broker had some outstanding Centrals from the '12-'13 crop they'd be gone so what they have now may have been picked over.
Also, ask yourself how long you'll have the coffee on hand. Buying a very good coffee remaining from last year won't hurt you, but don't buy enough for 2 years or it'll be 3 years old by the time you use it up.
