Might be obviously, but there is definitely a lot of biases in the data here. It's unavoidable. E.g. many bugs will not be detected, but they will be removed when the code is rewritten. So code that is refactored more often will have lower age of fixed bugs. Components/subsystems that are heavily used will detect bugs faster. Some subsystems by their very nature can tolerate bugs more, while some by necessity will need to be more correct (like bpf).