Delayed Gmail filtering

I subscribe to a lot of email newsletters ( Vox , We're Here , Tom Scott , Money Stuff and Heatmap News among many others) all of which I enjoy...but maybe don't always read. I don't want to unsubscribe because I do read them, but I don't need Dropout.tv 's episode announcement from three weeks ago floating around in my inbox. Ideally if I don't get to them they could quietly be purged in the…