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When a wine is mature? That has to do with many factors: origin, year, quality of the domain (in that period), storage conditions. No one can guarantee you.
The twenty years comes in sight, then only the best wines still be drunk.
When drinking an old wine, it is recommended to decant. (showering the wine in a karaaf). Reason: no residue in your glass.. Leave the bottle always 1-2 days after transport stand up straight.