Antibodies to SARS-CoV-2 Remain Stable, or Even Increase, Seven Months after Infection
The paper: https://www.nature.com/articles/s41467-021-24979-9.pdf
Yesterday the thought struck me that "65 years old" is a rather odd number
You must complain by the Swiss statistics for the 65 year grouping. In fact nobody healthy any age with no comorbidity should take a CoV-19 gen therapy (Sinovac vaccine would be OK).
But your intentions are well known... I can't even remember your Avatar did once post some real information here...