Look at sys.obj$
That stores various dates for modify/create/analyze, etc of objects. Columns are not considered objects, and not recorded there.
Look at sys.col$. There is one date column there, but it does not appear to be populated, at least on the 9i database I checked.
How can I tell when a particular column was added to a table? I was looking for a DBA_view that would tell me but I must be missing something.
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