How to remove messages from mbox based on relative date?

[Mike Fedyk <mfedyk@matchmail.com>]

Hi,

I have a .procmailrc and am filtering, but now I don't want to have to
delete my messages when they get old in certain mbox files.

Can I run procmail with another conf file and have it send messages with a
"delivered" date older than N days?  Is procmail even the right tool, I'm
not so sure...

TIA,

Mike