As aks120 indicated, practice varies from one forum to another and also can depend on the individual threads, so your best bet for these sorts of requests is to PM the respective forum moderator(s), which can be found in the lower right corner of each forum's top-level page in desktop site mode, or alternatively use the /!\ report button to make a request (it gets sent to all forum mods)
One potential workaround though:
Originally Posted by
DanC73
[...] in this case started 10 years ago.... this makes it quite difficult to search & get anything meaningful.
also in desktop mode (I don't think there's a way to do this on the mobile phone version of the site unfortunately) you can do an Advanced Search:
and in the resulting dialog there is a dropdown to restrict results by date: