Every once in a while I get an image sale for an image that has not sold in a long time. For example - today I got a sale on one of my first images, uploaded in 2008 and only sold twice. This image hasn't sold for 5 years! Yet yesterday someone found it and purchased it - so it just goes to show that old images can still contribute to your returns :)
How about you - any images that you've sold recently that haven't sold in a long time prior?