delete mbox mail from comand line

[Mark Gillingham <markgill@uwalumni.com>]

In Mutt, I just learned;), that one might delete messages more than 1 
week old like this:

D ~ >1w

followed by q (quit) and y (yes, I want to purge the messages).

How might I do this from the command line in Mutt or another application?

Mark