Can old cooking sherry make you sick?

Old cooking sherry can potentially make you sick if it has been stored improperly or if it shows signs of spoilage, such as an off smell or unusual color. However, cooking sherry typically has a high salt content and preservatives that can extend its shelf life. If it has been opened, it's best to use it within a few months; if it's been sealed and stored in a cool, dark place, it may last longer. Always check for any signs of spoilage before using.