I’m a nuke from the generation that built the stuff we currently have,yea, a really old nuke that has been around!
The majority of us who designed that stuff are no longer here. A meeting I attended 5 years ago made it clear that the DOD knew the all the nuke designers were gone since we had won the cold war (barf) and old nukes from the sputnik generation were gone;their experience walked out the door not to be replaced. According to Secretary Gates, the US was the only nuclear power that no longer had the capability to design and build a new nuclear weapon!
I have been wandering when someone out there realized what I know. Some of the old nukes have vacuum tube technology. Warheads degrade in power. The old launch systems can’t blow their silo blocks in snow, let alone a couple hundred feet of rubble. No nukes are loaded on the B52’s, B1’s, or B2’s we have (as if in a first strike someone will give us a timeout!) The only system that may work are the navy boomers and a great deal of those have been fixed with conventional Warheads (huh?). If the nukes we have are used, chances are we will be throwing duds. In answer to my concerns, the Russians have figured it out and that may be enough for them to give it a shot.
The Congress and administrations for the last 30 years through their short sightedness has put our nation in peril to the point of treason!
Russian nukes are likely in the same shape. The Russia's manufacturing ability has collapsed, some parts of the production chain are in Ukraine. New designs often fail tests (like the seaborne "Bulava") old ones (same "Sputnik" era) are still in service, like "Satan". "Satan"'s control systems are as obsolete as American ones, if not worse. 
Soviet control panel
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Some carriers, like Tu-95, fit a museum collection more than an Air Force.