Most of use cannot eliminate printed materials - sales folks still like the comfort of a "leave behind" after a physical meeting - and that's OK. But, as we all have reduced our use of printed materials, the pieces we do print commercially (and expensive) have VERY long shelf life.
Dating material HIGHLIGHTS "this is a year old" which indicates "we have not updated the product in a while."
Also... people are pretty smart. They won't need a secret decoder ring to figure out "111008 ."