Sent by CharlotteEditor: No, I don't think you need to worry about getting sick from old lentils or other legumes, though I would recommend rinsing them thoroughly before cooking to wash away any dust. At worse, the legumes won't taste as great or cook as evenly. I often find that old lentils get mushy as they cook rather than keeping their shape.
Readers, what other advice or experience do you have to share?
Related: How to Cook Lentils on the Stovetop
(Image: Emma Christensen)