Definition - What does Young mean?
If a wine is described as young, this means that is still has some time to mature. It may be a wine which has been recently bottled or a wine which is notably not ready for consumption. This may be the case in red, white or rosé wines, however, it is more easily detected in red wines.
WineFrog explains Young
The first prime example of a young wine which is marketed as a wine to drink within a short amount of time after bottling, is Beaujolais. Beaujolais is a French Appellation d'Origine Contrôlée (AOC) at the south end of Burgundy. These wines are the celebrated first wines bottled following harvest to mark another vintage. They are meant to be consumed young as they do not improve with age. There are other young wines throughout the world, which should be consumed young. They are easy to find, as they lack any oak elaboration or bottle-aging prior to release and are typically fruity wines.
A young red wine that is only a year old which has harsh tannins, without any perception of fruit is described as young. This wine, however may improve with age.
White and rosé wines can also be young, but it is more difficult to detect. But an oaked Chardonnay may present itself as young if the oak nuances have yet to blend with the wine. This can improve with age also.
A white wine that is young is often described as "green."