I think everyone who has posted a table of stats for COVID-19 infection or deaths seems to do a 10 year grouping. For example here. (Used only because I was looking at that post when it occurred to me.)
However, my understanding is that physiological changes in the human body are not linear over time but tend to be more like state changes. Now, it is true these changes are not on any annual schedule either but we do have some average ages for when changes in the human body seem to occur.
Could using the 10 year grouping actually hide important implications for those trying to make personal decisions based on that data presentation?