People 65 and over had an average 401(k) account balance of $202,800 in January 2015, while those between 55 and 64 had an average balance of $180,881, according to The Motley Fool and Vanguard. Younger cohorts had lower average balances, with people between 45 and 54 averaging $122,566 and those between 35 and 44 averaging $65,204. Employees between 25 and 34 had an average 401(k) balance of $25,259. Finally, those under 25 had an average balance of $4,407.
The overall average Vanguard 401(k) account balance of $101,650 represented an all-time high and an 80-percent increase since 2008, according to The Motley Fool. However, that account balance is skewed upward by a relatively low number of people with extremely high balances, noted The Motley Fool, and thus does not represent what the typical account holder holds. The median 401(k) balance of $31,396 lags well behind the average account. The median account balance for people 65 and over was $72,957.
Investors with Fidelity Investments held an average of $91,100 in their 401(k) accounts as of June 2015, according to the Detroit Free Press. Breaking those numbers down by generation revealed that baby boomers had an average balance of $152,900, Generation X employees averaged $83,200 and millennials averaged $22,100. Fidelity had 72,000 customers with at least $1 million in their 401(k) accounts at the end of 2014, according to CNBC.