I prefer dating girls (but my wife won't let me !).
As far as production dates go on ammo, depending on the storage conditions, this product has an almost infinite shelf life.
Much of the surplus ammo available is/was from the 1950's to 1980's and will be good for the rest of my life; and beyond. Unless ammo is stored in wet conditions, factory ammo is stable. You are in Arizona, the lack of humidity will be your friend in the storage of powder and handloaded ammo. The stuff you load should be good for a few years, if you seal the powder can(s) the same should apply.The only caution would be to control the amount of heat that you expose ammo and powder to , excess heat would shorten the shelf life of the powder in the can, not as quickly in the loaded case. As a note, I have shot 20 + year old handloads and factory ammo that was made in the 20's and 30's. Don't be too concerned.