Biology
Cohort Replacement and Generational Value Shifts
Quick fact
Surveys in post-industrial countries like the U.S., Germany, and Japan show that the majority of societal value change over recent decades—such as rising support for same-sex marriage or environmentalism—is due to cohort replacement, not individuals becoming more liberal with age.
Why this is interesting
Your grandparents likely see the world differently than you do, but it's not because they changed their minds as they aged. What if entire societies shift their values simply because older generations pass away?