Fred, That is pretty old but, as you have found, can still work.

I would always recommend keeping powder in its original container, though. Glass is not recommended because the chemicals are a little less stable next to glass and it is more fragile in case something happens. Plus, non-transparent materials do not let U/V light penetrate and affect the chemical structure of the powder. Similar to medications- keep away from heat, light and moisture!

But, that's older than some of the powder I have used successfully!