What is the meaning of the label "Reserva" on a Spanish wine?

aged for at least one year
60
aged for at least two years
107
aged for at least three years
237
aged for at least five years
149
In Portuguese and Spanish wines, the requirements varies between regions, but typically, when used on a label "Reserva" means that the wine was aged for at least three years in the cask and bottle, at least one of which must have been in the cask.
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