You're right, miles01110, and thank you, but wouldn't you need to create this Rule multiple times for multiple different senders? Is that unwieldy? Unfortunately the Rules don't seem to allow different Boolean operators within the same Rule - I'd like to set a Rule for:
Senders address contains [x] OR
Senders address contains [y] OR
Senders address contains [z] AND
Date received is more than [ ]
to deal with them all at once. Then any new sender you would like to treat this way can easily be added to the list of senders. You could delete advertising emails after 2 weeks or a month, archive financial info emails into different folders etc.