I don't know about the others, but I could easily edit my oldest post. Without any problems whatsoever. I do not know, maybe for moderators it is allowed? I personally know nothing about banning editing old posts for regular users. I can not say anything specific about this, unfortunately.
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Editing a post specifically for Royse777
I read this topic, so I understood that you are working on a problem if there is a possibility to edit very old posts. I decided to take part in this experiment, so I opened a post written in 2014, June. I tried to edit it and I succeeded. So I assume this is a kind of temporary bug or something.