How long do you keep your seed for?

[AZGardener]

Hi guys! I'm going through my seeds over the next week or so and I'm trying to determine what to toss (SO hard for me to toss any!!!!) and what I can keep and feel good knowing they will germinate. The oldest seeds date back to 2009. I have kept them in a cool dark place and sealed in baggies within a plastic bin.

So how old are your oldest seeds and when do you decide to toss them?

Thanks!!!