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/usr/share/doc/tin/examples/expiretover is in tin 1:2.4.1-1build2.

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#! /bin/sh
# expire old local cached tin overviews

# purge all files which weren't accessed in the last numdays days
numdays=28

overviewbase=${TIN_INDEX_NEWSDIR-"${TIN_HOMEDIR-"$HOME"}/.tin"}
if test -d $overviewbase ; then
	( find $overviewbase/.news* -type f -name "[0-9]*.[0-9]" \
		-atime +$numdays |\
		xargs rm -f ) && exit 0
fi
exit 1