Rocket propellant life is shorter than that. From what I know of the Russians', its about 10 years. You could already see PLAN phasing out Shtil missiles that were bought in the 2000s, which is a good reason why they are changing the Sovremennys to HHQ-16. You can also see the gradual phase out of the Moskits, even if that uses jet fuel (supplied from Russia and stored somewhere? Not using Chinese fuels?)
Army researchers extend missile system shelf life
Due to the success of the program, the average shelf life for missile systems has been extended from 7.9 to 22.6 years.
10 years for a manufacturer guaranteed shelf life sounds about right for a solid-fueled missile.
I see the SM-1 and Rapier missiles were rated at 8 years previously.
But with additional ongoing testing, missiles can be used beyond the manufacturer guarantee. See below
Looks like a picture from DSANew photo at defence expo shows something like a new frigate design with integrated mast. Could be a hint of the look of the 054b
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The Weibo link is not working.