If there's one thing I've learned from tasting older wines (over 5 years old), it's that they can't be rushed. This '98 Chateauneuf-du-Pape (CdP), didn't begin it's ascent until an hour after opening. If you don't have the time or tools to decant, the best thing you can do it to keep pours small - maybe even pour more than one glass at a time per drinker.
This wine initially gave off a nose of apple, smoke, and game, then, after an hour or so, had this distinct scent of earth-candy, baking spices, and roses. The wine was highly concentrated, deep ruby, and primary notes of red and black fruits still graced the palate.