Rhythmbox: Removing old podcasts

[Jonathan Ryshpan]

I've been downloading podcasts to Rhythmbox for a while and have now
accumulated about 88 Gbytes of them.  I would like to delete the old
ones, say older then 4 months, while preserving the feeds.  What's the
easy way to do this?  A while searching the web has produced no help,
not even the location of a Rhythmbox mailing list.

Thanks in advance for your help - jon