The late answer queue just went to 1.2k on Mathematics. On other sites the same happened (EL&U 850, SO 1.5k, TeX-LaTeX 500). Why did this happen?
According to a comment on this post, there are no old late answers left over since begin 2013:
No, the "minimum creation date" is being automatically gradually shifted back in time. In ~2 months, the Late Answers queue will cover all of Stack Overflow (first post on 2008-07-31!). – Emmett Dec 26 '12 at 23:30
Did the definition of late answer somehow change?