Business Insider listed the top 16 heirs in the world, all with net worth above $14.4B. If you look at the Forbes Billionaires List, $14.4 would be about the 70th richest billionaire. If the rest of the rankings go from that SSS, approximately 23% of billionaires inherited their wealth. I'm sure some others inherited a lot of money and wound up increasing that net worth further, but that's a rabbit hole I don't want to go down.
Effffffffffff billionaires.