I just voted to close this two-year-old question because I believed that it was off-topic for Super User, and that it belonged on another site in the Stack Exchange network. However, I was not given that sub-option. I’m pretty sure that, until the recent revision of the VTC reasons (when “Not a Real Question” was abolished), there was a message saying that questions over a certain age were ineligible for migration. The policy seems to be unchanged, but the message is gone, leaving the prospective close-voter looking in vain for the button he wants to use.
Please restore the “too old to migrate” message. (Or cancel the “too old” policy; just be consistent.)