Good info.!
Does that source state what the likely reduction in viability is after, say, 4 years for tomato seeds in good storage conditions? I’d think it’d be at least 50%.
All the sources I’ve seen say it’s all about storage conditions. Under 50 degrees, steady 40% humidity. None go into specifics about reduced viability over time.
https://www.highmowingseeds.com/blog/seed-viability-chart/
I did read an article that said the older seeds can make for weaker plants. The way I figure, if they’re at their limit, do 2-3 seeds per hole and snip down to the best.