Yes, active what does it means?
My point of view of "active" means that user continues to interact with the community, posting content, and that his last post must not be older than a month.
But the definition of the word "active" will determine whether it has been active in the last 10 years, 5 years, or 2 years.
What will we gain from such topics? What would you do if you found out who he was? Are you going to send him a private message or what?