but if it has been over 5 years, it is a pretty safe bet. the exceptions are my professional resources, although lately, much of that is available online. Still, I like being able to know just where to find something if I need it.
For the kids, if they have not touched it in a year, we put it in a bag and put it out of sight. If they don’t ask for it in the next few months, it gets put in my “to sell” pile.