If you don't want to plant them immediately, they will keep for up to three years if you keep them in a refrigerator in a paper envelope. However, they will lose viability after time. Good luck!
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I have still had 80% success rate from seeds that were something over three years old. However, this is probably due to our crisp dry climate. I only ever use paper or cardboard to store seeds, and don't like leaving in the plastic bags they sometimes arrive in. The biggest problem with 'old' seeds is that the inner membrane, between husk and kernel, (which cannot even be seen with very fresh seeds) starts to dry out and shrink, taking on a slightly brown colour. Overnight soaking of seeds, before planting, will help loosen this inner membrane. I've also been really successful with very old (2-3 years old) adenium seeds, and was once told they only had a three months' shelf life. Obviously, the way you store your seeds if the most important factor, dictating ultimate success or failure, when you decide to germinate. Hope this helps.
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