2nd hand sales values do appear to be higher for iOS devices. And in my mind they are usually better built. So I agree the average lifespan may be longer. But

2nd hand sales values do appear to be higher for iOS devices. And in my mind they are usually better built. So I agree the average lifespan may be longer. But this doesn't mean that good 2nd hand Android devices don't get passed on to family or friends. All the devices in my family whether iOS or Android get passed along. The Android handsets are perfectly fine.