EBRI: Account Balances Rose in January 

On a monthly basis, EBRI produces estimates of the cumulative changes in 401(k) account balances — as a result of both contributions and investment returns — for several combinations of participant age and tenure. For individuals in the EBRI database during January, the average account balance rose 5.1% for participants ages 25 to 34 with one to four years of tenure (and consistent participation since 2010), while the average account balance gained 3.0% for participants ages 55 to 64 with 20 to 29 years of tenure.