I know there are some M2 sets still sometimes used but those will be replaced once the 30-60 some odd bar car sets come in.
Also on a separate note, you really can't fault the MTA here for running old cars, they actually do some pretty good maintenance on there fleets both commuter and subway. Running old cars is about maximizing the invest in your fleet, the average lifetime generally being around 40 years.
It seems the MTA learnt there lesson with differed maintanance after the 80's. Just look at the current state of MBTA to the north or WAMTA to the south (it also helps the MTA has a large dedicated funding stream which allot of other transit properties in US lack)
The intercity 125 in the UK despite being over 40 years old is still fast (125mph), reliable (engines have all been replaced fairly recently) and very comfortable and quiet, even in standard class.