We have been through this discussion many times. The edit function is essential to a non-fragmented discussion. At some point, it was decided that for "established " members, the edit function would be available for a very long time (i.e., forever). For much less established members, the risk of individuals doing such edits to erase homework questions outweighed the advantages of allowing them to edit whenever. As I recall, they still had a limited period in which they could edit. I don't know what those limits were or whether they still exist, but it is frustrating to join a thread and find the original question has been removed.
You have 177 posts to date. As I recall, that would exceed the number needed to edit at anytime. The problematic cases typically had less than 25 posts, e.g., a student trying to get answers to homework due tomorrow.
I do not know the current policy, as it has not been an issue for me. Maybe someone more knowledgeable will fill in the details of the current policy.
John