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50yr old powder works just as good as brand new powder if it was stored properly.
I have powders that I bought just 10 years ago and they work as good as my 30yr old powder.
If you store it properly, I would buy enough powder to last your lifetime because it's only getting more expensive and it's price is rising faster than inflation.
When I restarted reloading a few years ago, I used powder that I had stored properly for over 20 years. I finally went through all my Win231 from back then and finally had to buy powder. The old powder worked just fine.