Put a handfull in a wet papertowel on your window see if they germinate.
Excellent response. Check germination rates and find out.
But as long as seeds are kept in a cool, dry, dark place, they will last for many years. I've planted clover seed that had been kept in airtight containers in my basement for 15 years, and they germinated just fine.
"Know where you stand, and stand there" --Jesuit Father Daniel Berrigan
"There is no reasoning someone out of a position he has not reasoned himself into." --Clive James