Storage life of seeds

Asparagus 3
Bean, Lima 3
Bean, Snap 3
Beets 4
Broccoli 5
Brussels Sprouts 5
Cabbage 5
Carrot 3
Cauliflower 5
Celeriac 5
Celery 5
Chicory 5
Chinese Cabbage 5
Cucumber 5
Eggplant 5
Endive 5
Kale 5
Kohlrabi 5
Leek 3
Lettuce 5
Muskmelon 5
New Zealand Spinach 5
Okra 2
Onion 1 - 2
Parsley 2
Parsnip 1 - 2
Pea 3
Pepper 4
Pumpkin 4
Radish 5
Rutabaga 5
Salsify 2
Spinach 5
Squash 5
Sweetcorn 1 - 2
Swiss Chard 1 - 2
Tomato 4
Turnip 5
Watermelon 5

I assume this would be in years, yes?

Storage? Under what conditions? There have been seeds recovered from tombs that were still viable after thousands of years.

Yeah, it seems like this could be measured more in percentages or something...

1st year... 80% germination
2nd year... 75%
3rd year... 70%

etc... ??

I can't speak about all these seeds, but I've planted 5-year-old okra seeds with fine results.