My windows are probably original, from 1978. They are normal windows plus storm windows. The storm windows rattle like crazy in the wind. There's a lot of wind here in Boulder, Colorado. What's a good way to keep them from rattling?
You need to figure out what exactly is rattling. Is the storm window rattling against the normal window, or is it parts of the storm window rattling against each other?
Without a picture to show exactly what's loose, my general suggestions are: