Onion seed life is 1year. But, yes, likely some 2-3 years old may sprout. Your stuff is old, so don’t waste too much time or space or optimism on those!Speaking of onions, I have DOZENS of onion seed packets from my mom's stuff. I think all of them were packaged between 2016 - 2018. I've read that most onion seeds are not viable after 2 years. I'll still try to germinate some of them but don't have high hopes. Anyone else who can confirm or deny this?