Which label term on Argentine wines indicates longer aging and oak maturation?

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The label term reflects how long the wine has spent aging, especially in oak, before it’s released. In Argentine practice, a wine marked as Reserva has undergone more aging than the baseline styles, with a longer period in oak and additional time to mellow in the bottle. This extra maturation helps soften tannins and develop more complex flavors like vanilla, spice, and toast from the wood, setting it apart from younger, less-oaked styles. Viejo isn’t a formal aging category, and Gran Reserva implies even longer aging but is not as commonly used in Argentina as Reserva. So, Reserva best signals longer aging and oak maturation among these options.