As I have visited the forum off and on over the past 15 months, I have noticed there is a preference for new topics to be created instead of bumping old ones.
As the maintainer of a Discourse site myself, I would like to strongly recommend two things for your instance.
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Enable “Auto close topic after” within each Category setting. Admins are able to set the time frame for a topic to close after the last reply. This helps prevent very old topics from getting bumped by newer users.
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Install and enable Discourse Solved. Using this shows other members when a solution for a specific help topic has been found. Additionally, it has an option to auto-close the topic a set number of days after the Solution has been selected. This would also prevent the above situation from occurring.