In today's post, Alice Feiring speaking of Sagrantino, states that, "... and the wine has proved to be one that does not age for a long time". All of the Sagrantino I have had has been very tanic and reason would suggest that the inherent tanins, and their preservative qualities, would allow the wine to age considerably. Other than acid and (I assume) tanins, what allows a wine to age and/or be preserved naturally? Or what is it about Sagrantino that does not allow it to age?