However, given the APK context, here is the breakdown of the situation regarding YouTube on Android 6.0.1 today.
For devices running Android 6.0.1 (Marshmallow) , the official YouTube app has reached its end of life for new updates. Google dropped support for this version in youtube apk android 6.0.1
The very last official version of YouTube to support Android 6.0 (API 23) was version 17.34.36 , released in late 2022. The Reality Check: However, given the APK context, here is the