I think they answered the question for you. They seem to be growing fine. Sounds like they just want you to buy new seeds every year - it's a marketing ploy.

Thanks B, I'll set another dozen tomorrow.

the fact they have germinated means they are fine. often seeds deteriorate once the packet is open. hence the instructions on the packet. I always try 'old' seed and if they don't germinate I buy new.

My beets & carrots are both up and coming along nicely too.