Hi OP
We're in the process of discussing this but just to copy over our previous response -
'This feature is primarily meant for those searching for information - if the first thread they land on doesn't entirely answer their question, they get suggestions for others that might. It's very much a work in progress - over time we'll be able to tweak it to make it more accurate - so telling us where you think it's not quite right is much appreciated. We have underweighted older threads in the algorithm but if it causes any problems with zombie threads, again, this is something that can be easily adjusted.'
We're going to close this thread now, as there's quite a few - we'll be replying over on this one.