jQuery has been there for 13 years and it's still being used today (although a lot of people have moved away)
React has been there for 6 years but only recently started to gain the hype.
Knockout has been there for quiet a while (9 years).
I'd say that good JS frameworks can easily live 10 years. But there is constantly a lot of hype regarding new frameworks because of how easy it is to create a new one. It's like somebody is constantly making and releasing new frameworks.
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