Linda....many seeds will be viable for years. Just be sure to keep them dry, and not in an overly-warm environment. Ziplock bags, rubbermaid/tupperware containers are all good for storage.
If you ever want to check germination before planting, just put a few seeds into a moist paper towel, then stick the whole thing into a ziplock bag to keep it moist. Keep it somewhere fairly warm, and you'll be able to see if you seeds sprout in the paper towel. If they do, your seeds are good to plant!
