Don't know the exact age. They look new by looking at the primers, shiny as the small rifle magnum and large magnum rifle rimers I paid too much for this year. Going to load 50 rounds and see how they do. I don't know how old some of my primers are but I still have Winchester in the orange and white box. I had a couple of cases of them and they are still going bang. They were stored properly.
And don't mention old powder. LOL! I still have some Green Dot in a cardboard 8lb canister. Sticker price on it says $64.99 (I don't shoot much shotgun anymore). Tried some of it last year and it worked well enough to kill a few doves.
