平均值（average）是與巴菲特，馬斯克等等去平均。
The median retirement account balance in the U.S. is $87,000
The median retiment account balance by age in the US is
45 to 54歲：115,000
55 to 64歲: 185,000
65to 75歲：200,000
75 or older 歲：130,000
The median net worth was $192,700 for the same year. The average American family’s net worth was $1,059,470 in 2022, according to the most recent Survey of Consumer Finances.
Real median household income was $80,610 in 2023 (the latest data available), representing a 4% increase from 2022, according to the U.S. Census.
https://finance.yahoo.com/personal-finance/banking/article/savings-and-wealth-statistics-215214936.html
