https://www.joshuakennon.com/1821745...00000-or-more/
1,821,745 households in the United States have investment portfolios worth $3M or more. This group contains:
893,344 households with $3,000,000 to $5,000,000
679,242 households with $5,000,000 to $10,000,000, and
249,159 households with $10,000,000+
There are approximately 125 million households in the U.S.
Thus, having investments valued at $3M puts you in the top 1.4% of all households. By that standard, I'd say it's unreasonable to expect the average person to accumulate $2.5M by age 60.