No alcohol is actually a form of a disinfectant. The flavor might be spoiled (especially if the bottle has already been opened) but it is still safe to drink. In fact most people prefer extremely old wine because the flavor is better. Wine has about 7% Alcohol and Jagemeister has about 40% alcohol.
No alcoholic beverage expires. This includes Jagemeister. You should be fine to drink the bottle. Keep in mind, though, that alchol does stale. Therefore, the tatse quality of the bottle may not be what your used to.
It should be fine to drink. Alcohol has a very long self life. Some alcohols due have a "best by" date printed on them. However higher alcohol content beverages don't really go bad since bacteria can live in such a harsh environment. Store your alcohol in the fridge to get the most out of them.