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A few days ago I watched a video of a tour of a Minuteman missile silo control center, and there was a moment where the guide mentions "These are the computers that control the missiles, your phone has got much more power than them but these remain unhackable as most of their language has been forgotten".
You must have seen this video on Focus

Whatever programming language cannot be "forgotten", it's written in manuals. It's not like making film. It's really much much much easier.
Besides, I cannot believe that a nuclear weapon system can be kept in such a poor state of maintenance. All aspects of the system certainly must be modifiable, and have probably been modified since their entrance into service.
Computers which drive missiles are not hackable simply because they are not connected to world networks such as Internet. You must have physical access to them.
Yes, that must have been on Focus! (or on Discovery channel, same quality).