Compound interest is fascinating. Someone mentioned the S&P500 at 10% for the last century. Here's $1,000 invested in 1925 then adding $100/month reinvesting dividends and capital gains. After so many years adding $100/month doesn't have much effect but notice what happens after about years 80...the rocket launches.
So it goes from 100s to 1,000s eventually $Millions/year in gains. This explains the "old money" wealthy families. As my Grandfather once said if someone invested properly, leaving it to heirs, within the 2nd-3rd generation no one would ever have to work again.
Wealth is often poorly managed by second and third generations, with studies showing that approximately 70% of inheritances are depleted by the second generation and 90% by the third. This dissipation is often due to a lack of financial education, poor decision-making, communication gaps, and a failure to plan, though the youngest generations may also have different investment priorities like growth-oriented or sustainable strategies.