i am using 40 meg crystals which are around 12 or 13 year old, and 27 meg ones over 25 years old with no problems. the crystals can be damaged quite easily by hard knocks but thats about all. have had problems with futaba 40 meg receivers in the past, if they were left for any length of time they either didnt work or became jittery. one of them needed to be left with power to it for a few hours then it worked fine, the jittery one became bin fodder as it didnt correct itself. they werre left for about a year, the one that just stops working still does so and wakes up again after treatment, still gets used in one of my more regular toys..
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