Live Long and Prodigiously
My theory on this is that with sufficiently extended lifespans, people will indeed change careers and refresh themselves at intervals. People already do this to some degree, but more time will allow it to be more definitive.
Despite getting new training or education, or refreshing themselves with sabbaticals that do as much, nobody will ever shed completely their old knowledge and experience.
If anything, this will be even better for creativity, discovery, and making new connections.
It will be fascinating to watch widespread, dramatic life extension unfold.
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