I cannot update on my I pad.   Is my ipad too old?  Software update failed is the message I received. 
Thanks 
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If your iPad were too old it would not allow for a software update to even be attempted so that's not iikely to be the reason. I've had others with the same issue and I've been recommending they try directly plugging in your device into a computer and running the update from there. In 10.15 Catalina and higher you'll use a Finder window to run the update once the device is plugged in. Earlier versions of the computer OS would use iTunes/Music.