Aspects include a method for expiring out source code comments. The method includes parsing source code to locate one or more comments. The method also includes, for each of the located one or more comments: determining whether the comment specifies expiration criteria; determining whether the expiration criteria meets an expiration threshold based on the comment specifying expiration criteria; and deleting the comment from the source code based on determining that the expiration criteria meets the expiration threshold, the deleting resulting in updated source code. The method further includes storing the updated source code.