In other forum software, topics are called threads, not naming names here. Good practice to assume he means topics until told otherwise.
I'm not sure if it's tracked, but if you could get the date when a forum was created, you could make your own variables in a template event using some math, the current date, and that date.
If it's not, I'm sure there's some event that tracks when it was added, you can insert a column into the forums table tracking that date.
I am a web developer/administrator, specializing in forums. If you have work you need done or are too lazy to do, pm me!