Seeds can be stored for many years and still remain viable with high germination rates. For best results, store seeds in a cool, dark, and dry place. A dry basement, dark cupboard inside a paper bag works great. Avoid putting seeds near a dishwasher, sink, or oven. Do not leave them out in the sun for extended periods of time. Some seeds like soya beans do best with fresh seed saved the previous year, but many seeds can be kept and stored for many years before growing again.
The longer you plan to store your seeds, the more care you will need in preparing them and storing them.