It was just an random border line i have written . 
Correct it should be there is no need to report posts or threads that going back for years and they should be as they are.
If i started reporting i thought ok lets check all threads from the beginning and working forward to the threads today.
But after a few hours i have started i got an pm from hilariousandco or mprep and they explained and written that there is no need to doing that for old threads and post.
Guess if the thread is active and have new post in it you can report in there.