Which causes of death have the most (roughly) constant incidence rate among all age groups, and what are the mechanisms whereby those causes of death have this property? (Any answer can of course look more like "here's an example and its graph- it's pretty constant" given how difficult I assume an exhaustive statistical analysis would be to produce.)
For example, cancer is not nearly constant because it mostly affects older people and neither is gun trauma because it mostly affects young adults. I recognize this question may be a bit loose because I have little to no medical experience from which to draw in the service of more precise wording, so feel free to interpret "cause of death" however is most convenient to answer the question in an interesting and/or enlightening way. Regarding research, I tried to Google an answer to this question but only got articles talking about how aging and death seem to be inevitable (which apparently Google is allowing as a synonym for invariant given the words "age" and "death"), so either I'm not asking the question right or nobody's asked it before (at least in a way that helps me). As for motivation, I just got curious recently and decided to ask around. Hope that's acceptable- thanks!