Disable quickreply if a thread is older than X months

[creesch]

Hello,

I am a admin for a small community, this community is pretty old in web therms (About 7 years). As a result of this we have posts an threads on our forum that date back to 1999.

This is not real a problem, but lately we there are some people who get on the forum through google and give answers on threads that are months or even years old. (most of the time the original topic starter isn't even around anymore).

In order to prevent this i was thinking of disabling quickreply and showing a warning in the normal reply window if a thread is older than say.... 5 months.

Is this possible with a standard board ? Or is there a mod around for doing this ?