To override this behavior, use the NOWARN option in the PROC DATASETS
statement.
If one of the related-SAS-files does not exist, the procedure prints a warning message to
the SAS log but continues to age the SAS files that it can.
If you age a data set that has an index, the index continues to correspond to the data set.
You can age only entire generation groups. For example, if data sets A and B have
generation groups, then the following statement deletes generation group B and ages
(renames) generation group A to the name B:
age a b;
For example, suppose the generation group for data set A has three historical versions
and the generation group ...
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