This is good news about long-term immunity after vaccination.
"immune memory to many viruses and vaccines is stable over decades, if not for a lifetime...
For SARS...originally identified in 2003...the continued presence of high concentrations of neutralizing antibodies in blood serum for more than 17 years was reported in 2020. Wang and colleagues' [new] results suggest that long-term immunity might also be expected for SARS-CoV-2"
I didn't realize that plasma cells can be converted to memory cells, residing long-term in bone marrow, ready to be summoned for future infections.
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