Persistence or Backbone
This is one of the best ways to define the level of maturity of a wine. That is to say the taste and awareness in ones mouth is long-lasting or persistence. The flavors and texture, or the feel in the mouth persist a couple of minutes after drinking. This is a strong indicator that the wine has a good aging potential.
As wine ages, that persistence is increasingly shorter and flavors disappear with time. Still this is a good indicator if you are considering purchasing several bottles or a case to lay-down for awhile. Important as so many of California wines are being produced or released ready to drink and are likely not to improve with age and should be enjoyed in the next three to five years to really enjoy them.
Have you thought of maybe sending a gift of wine?