Simply check the last chat post, and if it is over 30 days, a red box will be indicated under the message creator. It will say that this thread is over (insert amount of days old) old. If you want to ask a question related to the mod, check the box that says "I am aware this thread is old, but I still want to make a reply.", but if you just want to say something that will clearly never happen or say something that doesn't help, don't reply to the thread.
