A comparison can still be made between the same age cohorts i.e. compare rates of Alzheimer’s for the cohort 60 to 65 year olds. There is always a potential for confounding factors, but if the rates are up 35% for all cohorts then that says something.
Also the beautiful flow graph https://images2.minutemediacdn.com/image/upload/c_fit,f_auto... (graph for US Women I think) does show that after about 70 “mental” starts being a significant percentage of deaths, although Parkinson’s is only one component of that I think.
Also the beautiful flow graph https://images2.minutemediacdn.com/image/upload/c_fit,f_auto... (graph for US Women I think) does show that after about 70 “mental” starts being a significant percentage of deaths, although Parkinson’s is only one component of that I think.
Source for graph is: https://flowingdata.com/2016/01/05/causes-of-death/