If you try to open an older version of the app (like version 16.40.36, which was one of the last to support Android 5), you will likely be met with a forced update screen or a message saying, "Switch to YouTube.com" . 2. Why Support Ended
Using an Android 5 device online carries inherent risks that you must mitigate. youtube android 5 version
Here is a reconstruction of the text found on the and the "About" section of the app during that time. If you try to open an older version