As weird as this sounds, I am wondering if there's a possibility to clear inactive accounts past a certain month? Say I'd like to clear all accounts inactive more than 6 months, how would I be able to accomplish this or will it mess stuff up?
Be very sure that you want to do this. If you delete their accounts, posts will remain but will be unassociated with any accounts. If a user decides to return and creates a new account, it'll be very difficult to re-associate their old posts with the new account.
Personally I don't delete accounts, they are either left as they are or I remove/change details in them. The only accounts I do delete are those with 0 posts and content.