For example, the current Bordeaux vintage is 1990. For the classified growths, first through fifth, start trying them in 1995. Properly stored, they may drink well for 30 years or more. Then again, they may not. But consumers can try the less expensive cru bourgeois 1990s now and expect them to reach their peaks within 10 years.
Burgundies tend to be more temperamental and fragile than Bordeaux.
If possible they should be sampled before cellaring, in order to estimate longevity. To stay on top of things, it is important to taste cellared cases at least every two years. Don't be afraid about opening them. This year he opened a bottle of 1983 Puligny-Montrachet from his own collection. I expected it to be at its peak, but it was past its prime.