When/how do threads get closed for replies?

[SW FEA guy]

I'm new here, and there are a couple of threads that I wanted to reply to but they report that the thread no longer is open for replies. What gives? When or what constitutes that a thread should be closed?

At the bottom of the page it also reads: "(You have insufficient privileges to reply here.)" Maybe it's simply because I am new here?

 

[Greg Bernhardt]

Welcome! We usually close old threads. Check the dates. Feel free to start your own thread.

 

[phinds]

In addition to old threads, mods will close any thread that has gone seriously off the rails and is not adhering to PF rules and sometimes threads where the original question has been answered and what's left has become a bunch of nitpicking.

 

[jtbell]

Feel free to start your own thread.

And include a link to the old thread, if you think it's useful for establishing context.