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Boy, there are a lot of tasks on that list I need to catch up on! In particular, my "plant pharmacy" shelf needs a good overhaul!
I do keep seeds longer than two years. With a few exceptions (parsnips, I think, are an example), seeds remain viable for quite a few years as long as they're stored properly (dry, at controlled room temp), although germination percentages may decline. Testing germination as you suggest is an excellent idea! That way, you're not scrambling to find fresh seed if something fails to come up.
Today's article about making a rain barrel gives us yet another good "rainy day" project! As a bonus, you'll need to go to a place like Home Depot for those plumbing fittings... and I'm sure you'll manage to walk through the plant department on your way to the plumbing department... who knows what else may jump into your cart?