You would have to have much more information to know. First, what is the
average storage temperature, and how much variation is there from the
average on both a short term and long term basis. I would be very
unlikely to buy any wines that had been stored at an average temperature
of much over 60 F for up to 20 years. Also I would not want to buy wines
for which the temperature varies over more than a very few degrees over
a day.

The next thing depends om the specific wines. Some are not made to last
up to 20 years and would have declined even under ideal storage. You
mention Rothschild. There is Lafite-Rothschild and Mouton-Rothschild
that will sometimes improve for well over 20 years with good storage.
However in light vintage years they may not improve very long. Some
Caliifornia Cabernets can last well over 20 years with good storage,
while many others will be in decline. For example, even a 1961
Mouton-Rothschild or a 1959 Lafite-Rothschild should be outstanding with
proper storage at under 60 F with little short term temperature
variation. However many Bordeaux wines from 1984 might now be far into
decline even if stored correctly.

It is a sad fact that many collect large cellars of wines, but do not
store them properly and do not keep track of when they are ready to
drink. Nearly any wine auction house buyer can tell you horror stories
of cellars that would be worth $US 100000. if the wine had been properly
stored, but that are nearly worthless because of poor storage. Someone
who knows some of he wines for sale needs to taste some of these wines.
An auction house would insist on tasting some to avoid buying
storage-damaged wines.



My mailbox is always full to avoid spam. To contact me, erase
from my email address. Then add . I do not
check this box every day, so post if you need a quick response.