The add-on will allow you to display a warning for users in old topics.

Description: This small addon will help you ward off the spammers using old accounts that have been breached. What this does is set the accounts security lock to "reset" which means the user will have to reset their password before they login. The way to reset the password is the standard XF...

Description: Sends an email to staff when new post is saved to an old thread. This add-on is useful in situations where a member has posted to a very old thread and it would be better if a new thread were started. The staff member will get a notification email and will move the post to a new...

Description: Disallows replying to old threads. This add-on performs the same function as locking a thread, but does so dynamically based on the last post date. (Example post) (Example of options page) Features: All phrases start with oldthreaddenyreply_ for your convenience...

A small addon that allows you to specify the old price on the page with paid upgrades /admin.php?user-upgrades/, which will be displayed crossed out. Also implemented is the ability to automatically display the discounted price when applying a coupon.