Eating old pickles will not make you sick unless the old pickles have mold or bad smells to them.
Pickles when kept sealed in the jar can last for 2 to 3 years especially if the jar of pickles has never been opened.
Once you open the jar of pickles they will still last for around 2 years past the expiration date and it's best to keep the pickles refrigerated once opened but they are okay out at room temperature.
Just make sure to smell the pickle and look the pickle over before eating it especially if the pickle is 2 years old or older.
If you notice a bad smell to it or the pickle tastes bad or has mold on it then throw it out to avoid getting sick.
But as long as the pickles smell good has no mold on it etc then the pickles are safe to eat.