Shrimp With Skin Shedding Problems.

I too found a dead cherry in the tank this morning. It was possibly the largest in there, and it did look like a failed moult. However, if you think that these shrimps are probably up to a year old when we get them, a further year or so on, and they could be dying of "old age" whilst trying to moult? Does anybody have any idea of an average life span for a Red Cherry?

                                        Skittler