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

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Label terms on Argentine wines signal how long the wine has been aged and how much oak influence it has. Reserva indicates a longer aging period than a basic release and includes oak maturation, which softens tannins and adds integrated flavors, making the wine more complex. This is why Reserva is the best choice for signaling longer aging. By comparison, Crianza suggests less aging, Gran Reserva would imply even more aging but is much less common on Argentine wines, and Viejo is not a standard term for aging.