What should you do with an old Android smartphone? And how old is too old?

People are making their old hardware last longer or they are passing on old smartphones and tablets to their kids. But at what point does old become too old?

Article Link: https://www.zdnet.com/article/what-should-you-do-with-an-old-android-smartphone-and-how-old-is-too-old/#ftag=RSSbaffb68