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Hi gardeningsis, welcome to BYC!
We don't usually dissuade people from posting to old topics unless the topic is either no longer valid (e.g., a thread on if we should add private messages) or a thread that has been superseded by another active thread (e.g., the old coop design contest has been replaced by a new contest).
Other than that, if a topic is still helpful to you and the community, and has good information that just needs to be updated, there isn't really a problem in opening it back up.
I hope that helps!