A lot of people talk about repairing decrepitude of the body, but what about decrepitude of ideas and world views? What if advancement depends on the death of people with outdated ideas?
About 0.7% of the American public dies each year: https://www.cdc.gov/nchs/products/databriefs/db355.htm An idea that sees its support changing substantially faster than 0.7% per year is not primarily driven by older members of the public dying. The original Civil Rights movement, the fight for gay marriage, cannabis legalization -- all of these saw public acceptance shift much faster than population turnover can acc…
Another one is dictators. It seems like it took Franco's death for things to change in Spain, and Salazar's brain hemorrhage to change things in Portugal. Would Mubarak have been able to control the situation in Egypt if he was physically younger?