From https://www.quora.com/What-are-some-old-electronic-devices-that-are-still-being-used-in-the-present : although the Cold War is over, the technology used for controlling this US Government nukes still runs on 1970s hardware and software, specifically on the 1970s IBM Series1 computer.
The system controls the operational functions of US nuclear forces, such as intercontinental ballistic missiles, bombers, and tanker support. In the past, the Air Force has noted that since the tech is so old, it can’t be hacked.
[Russia is probably running similar aged nukes [control] systems. It is scary that most nuclear (mass destruction) weapons are 50 years old and depending on older electronic components (capacitors, resistors, transistors,… solder oxidization,…), a failure in maintenance may set the world radiating. ]