Why does my phone say some apps have stopped working?

[Android Central Question]

I stopped using my phone for 2 years and came back to this problem. I have updated a lot of things and it has fixed some app problems but not all. Youtube still doesn't work.

 

[B. Diddy]

Welcome to Android Central! Which phone? What version of Android is it running? It might just be obsolete. A substantial number of current apps no longer support older Android versions (like KitKat and earlier).