Default Copyright Notice
You can change Default Copyright Notice in Copyright Profiles
In windows: File > Settings > Editor > Copyright > Copyright Profiles
In macOS: Android Studio > Preferences > Editor > Copyright > Copyright Profiles
To update existing ones:
Updating a Copyright notice
In the Project tool window, select files or directories where you want
the copyright notice to be updated or just open the desired file in
the editor.
Right-click the selection, and choose Update Copyright on the context
menu.
To have copyright notices updated correctly, make sure that the
keyword specified in the copyright profile is a part of the notice
definition. Otherwise, IntelliJ IDEA will not detect copyright notices
and, instead of updating existing notices, will insert new ones.
To keep Copyright Notice Up to date:
You can use a regular expression to keep old ones up to date, for more detail see original documentation.
From jetbrains documentaion:
Allow replacing copyright if old copyright matches: Use this text box to type or edit the regular expression pattern that will be recognized in the existing copyright notice and allow replacing it with the new one. For example, if you specify the following pattern for year indication: 20[0-1][0-6], updates will affect all the copyrights with the indications of years 2000-2006 and 2010-2016.