Room Migration Alter Table not adding new column & migrate getting called again and again

Make sure your column is in model class. In your case, you are adding column age like this: ADD COLUMN 'age' INTEGER, so you must have int age in your model class.

Also, it is a good idea to write migration test to known exactly what is failing. You can find about migration test in android documentation here: https://developer.android.com/topic/libraries/architecture/room.html#db-migration-testing