You do realize the average lifespan is about 80, and people have kids in their 20/30s, which puts the typical age of inheritance in the 50/60s, who themselves are already near retirement age. It’s not as if you have a bunch of 18 YO using inheritance to gain edge. There are taxes on gifts, so parents can’t just give their kids more then $15k without massive taxation. Hell, you can’t even invest more than $2k/year tax free for college savings.