They should be absolutely fine. There's no reason not to use them.

Linda

With only a couple of exceptions most all vegetable seeds, when properly stored (cool and dry) are good for many years. You'll find discussions here where folks have used seed 10-15 years old and older. Over the years germination rates may decline slowly but if they germinate they are fine.

Dave

If it sprouts I see no reason why not to use them, I used 3 year old seeds with no problems.

A neat story

http://news.nationalgeographic.com/news/051122-old-plant-seed-food/

Definitely use your old seed. There are charts that will give you the years of viability for different veggie seeds, but they can be viable longer as Dave said.

Madonna

Seed preservation and deterioration is a big research topic. There have been tests on seed deterioration using rapidly chemically "aged" seeds. I think there is some evidence that such seeds are less vigorous when they sprout, but those seeds have been pretty badly abused. I think it's generally agreed that such deteriorated seeds are "leaky" and release electrolytes before germination is complete. But in general, for the average gardener, if it germinates, you're good to go.

P.S. This is a good place to say yet again how one should store seeds. Cool and dry. I put my seeds in the fridge in a ziplock bag, with some silica gal packets in it. That bag goes in another zip lock bag with more silica gel. That package doesn't get opened until it is THOROUGHLY WARMED to room temperature. Give it a few hours. The viability lifetime of seeds is hugely dependent on the conditions in which you keep them. I've had good germination rates for at least five years that way. In fact, I don't think I've ever had a reused seed packet with poor germination. (I use them up in five years!)

There are people who freeze seeds. That's supposed to work well too, though there are a few plants (I forget which ones, and I don't think they're veggies) whose seeds don't survive freezing. I read somewhere though that the freeze-thaw cycle was harder on seeds than the chill-unchill cycle. So if you want to put away seeds for a long long time, freeze 'em. If you're going to take your ziplock bag out every few months, the fridge might be better.