What are the aging requirements for "joven" wine in Spain?

In Spain, "joven" wine is characterized by its youthful, fresh qualities, and it typically does not undergo extensive aging processes. The specific aging requirement for joven wines is that they need no time in cask and are usually bottled shortly after the harvest, often within the following year. This allows them to retain their vibrant fruit flavors and primary characteristics, appealing to consumers looking for easy-drinking wines.

The other options suggest requirements for aging that are typical for more structured classifications of Spanish wines, such as Crianza, Reserva, or Gran Reserva, which involve specific minimum periods of aging in barrel and in bottle to develop complexity and depth of flavor. Joven's outright lack of aging requirements is what distinctly separates it from these other categories, making the chosen answer accurate.