I suspect most wars are like that. It's just that NATO has a better track record of hiding that fact.
The Abrams tank is from 1980.
Leopard 2 is from 1979.
Apaches are from 1975.
F-16s are from 1973.
The M16 rifle has been in service since 1962.
The 52 in B-52 stands for 1952.
Though NATO is doing way more upgrading on their active service stuff than the museum pieces the Russians are rolling out.