It is hard for us to give an an accurate time for the appropriate life span of Agreena. We are still frequently using one of our original prototypes from 3 years ago and yet some have only lasted for a year? It all depends on how much we demand of them and my test kitchen here at home is pretty darn demanding!
Agreena's has many uses and and is extremely versatile and this is reflected in its longevity. Wrapping and sealing isn't as wearing on the silicone material as heat so it can be a great idea to keep some wraps for baking and some for wrapping and sealing.
The Bakers Sheets are the real workhorses of the ktitchen and to be perfectly honest the sheets frequently used for baking will have a shorter life and will show their wear and tear in the way of staining. This is why the Bakers Sheets are wonderful as a designated baking tool and will still last for ages as ours have . But it also means that your other Agreena 3in1 Wraps will stay pretty and keep wrapping and sealing for quite a bit longer.