I would think most CCs would age well, but I don't know how long the Magnums had on the shelf before they were boxed and shipped. I have one in my humi that I've been resting about a month. I have no intention of smoking it any time soon, but we all know it's not gonna last
Think you can get up to 10 years at least out of the Mag 46. After that they may diminish some, though I don't have experience. I have had some that were 7-8 years old (lots of others probably have too) and they were very good IMO.
My rh is pegged separately 65 and 62 , and locker temp is 24/7 68f.
A specific factor is the limiting amount of exposure to fresh air .
25years would best be achieved with the least - (box opened once or twice) amount of exchange frequency - scaling down appropriately .