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If everything is indexed then people will find old pages which is a bit of a problem - and although I could put some standard text on the page, I'm worried this may lead to duplication problems..
Any ideas on timescale for unindexing?
If you do not use this tool the page may stay in the index for months.
However, I feel it would be better to reuse the same URLs, if it is possible to make so that they have the realted content.
Naturally you always may make so that the pages are never indexed if use NOINDEX meta tag.
<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">