Academy thread, 97 pages, over a year old.
Stadium thread, 112 pages, over a year old.
Other team's games, 480 pages, since August 2012.
Arsenal thread, 167 pages, over a year old.
AVB, 251 pages, since July 2012.
Chelsea, 65 pages, since April 2012.
Harry, 89 pages, since June 2012.
Bale, 125 pages, over a year old.
Trivia, 104, over a year old.
Liverpool, 197 pages, 2 days shy of a year old.
Lloris, 121 pages, since August 2012.
Fixtures and tickets, 73 pages, over a year old.
Defoe, 86 pages, over a year old.
That is on the first two pages of SN&V.
4th page has Kit thread, 96 pages, over a year old.
I have ignored the Match Threads for a reason, they attract lots of traffic and disappear after a few days.
Of the ones listed, it is - funnily enough - only the Other Team's games thread i'd keep at a push. The longest one. At least it is just from this season, despite being huuuuge. My suggestion earlier in this thread was to have one every week for that week's games, lock it on a Tuesday morning after the last game and start a new one.
The others, either season by season or move to classics and start afresh. To encourage new discussion, posters can start new threads. When it comes to housekeeping, merge them and move them to classics.
Have a ten page limit for each forum (not each thread!) and old threads that fall off those 10 get deleted automatically. I doubt people go back past the 2nd page anyway, unless they know there is a thread somewhere that can be bumped (I did it recently with the incorrect decisions thread). They come back to see their thread gone, merged somewhere and a few posts of 'there's already a thread on this' which i don't believe is meant entirely as helpful advice.
Stadium thread I see a reason for keeping, however perhaps it can be read-only and added to as and when something new comes along instead of being filled up with 'where is the stadium/enic won't build it/when does work start?' - if it's not in the thread, I doubt anyone knows. If they do, start a thread, a mod can merge it and open the big thread for discussion.