I'm surprised it's that high so I looked for some papers. Only two references I found so far are below which show much lower than 90% in autopsies. I'm not in the medical field so please help me understand.
Last I saw that stat was 2008, and I think the study was much older. I shouldn’t be so sloppy. Looks like it’s 60% for men 79+, but this is the no prior screening group, which specifically excludes known cases, so maybe a bit higher. Breast cancer is 12% and all cancer is 40% lifetime diagnosis risk in the USA.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4485977/
https://academic.oup.com/jnci/article/105/14/1050/965030