COVID-19 deaths by year of birth?
Data are usually binned in broad age groups partly because that's all the detail that's useful in some context, and because access to more detailed data often involves access to strongly controlled, personally identifiable information.
This preprint (full disclosure: I'm a co-author) gives information in 2-year bins for COVID in Ontario, e.g. this graph of the fraction of known infections (KI) hospitalized, and fraction of hospitalizations that resulted in survival, by (2-year) age group.
It looks pretty smooth, although if you squinted hard you might be able to convince yourself there were some breakpoints, e.g. between [60-61] and [62-63] in hospitalization or between [62-63] and [64-65] in survival (although I doubt these impressions would stand up to a formal statistical analysis ...)