What an Average Gen X 401(k) on Fidelity’s Platform Could Become by Age 67

Quick Read

• The average Gen X 401(k) balance of $222,100 could grow to between $724,000 and $1.2 million by age 67, depending on returns.

• Maxing out catch-up contributions of $8,000 a year from age 50 through 59 could add about $158,552 to the retirement total.

• Gen X has the highest 401(k) loan rate of any generation at 25.8%, which can reduce growth because borrowed money is out of the market.

A Gen Xer looking at Fidelity’s latest retirement figures sees an average 401(k) balance of $222,100 and an employee savings rate of 10.4%, and the natural question is whether that account is ahead of or behind the pack. How much could it grow by full retirement age? Earlier in this series, we looked at what the average Boomer balance can support today. This installment looks ahead, since many Gen X workers still have years of paychecks and contributions left.

What Fidelity’s Gen X Average Represents

Fidelity’s fourth-quarter data covers 24.8 million participants. Gen X employers contributed 5.0% of pay on average on top of what workers saved. Fidelity defines Gen X as people born between 1965 and 1980.

As with any average, a handful of very large balances can pull the number higher. If nine people have $50,000 and one has $2 million, the average becomes $245,000 even though most of the group has much less. The figure also reflects only one account on one platform. A worker may have additional savings in an old 401(k) or an IRA, while someone who recently changed jobs could show a lower balance.

Projecting $222,100 to Age 67

For anyone born in 1960 or later, full retirement age is 67, so that is the end point for this projection. The model begins with a 50-year-old, leaving 17 years to save and invest.

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The salary assumption is $64,064, based on the Bureau of Labor Statistics median weekly pay for full-time workers of $1,232, annualized. The model also assumes annual raises of 3% and a total contribution rate of 15.4% of pay, combining worker and employer money, deposited at year-end.

Monthly income is estimated using the 4% rule, meaning 4% of the balance is withdrawn in the first year. That annual amount is divided by 12 to estimate monthly payments, as shown below. The figures are in future dollars and are not adjusted for inflation.

For comparison, the 10-year Treasury yield was about 5% on October 27, 2026. That places a bond-heavy portfolio near the low end of the table, while a stock-heavy portfolio could end up higher or lower.

Four Factors That Can Change the Outcome

All of the examples below use the 6% return case. Increasing the savings rate by one percentage point, to 11.4%, lifts the balance at 67 by about $22,207. That increase comes from the higher contribution rate alone.

Catch-up contributions are extra amounts workers age 50 and older can add on top of the standard limit. For 2026, the regular employee limit is $24,500, while the catch-up amount is $8,000 for workers ages 50 to 59 and 64 or older, and $11,250 for those ages 60 to 63.

Putting in an extra $8,000 a year from age 50 through 59 would increase the ending balance by about $158,552 by age 67. Workers who earned more than $150,000 in 2025 must make those catch-up contributions as Roth contributions, which are funded with after-tax dollars.

Working two additional years, to age 69, creates two more years of contributions and investment growth. That would raise the balance to about $1,090,329, or $3,634 a month under the 4% rule. Delaying Social Security increases the benefit by 2/3 of 1% for each month past full retirement age, equal to 8% a year, up to age 70.

The average retired worker’s benefit is $2,071 after the 2026 cost-of-living adjustment. Waiting two more years would raise it to roughly $2,402. Under the 2026 Trustees Report, the combined trust funds are projected to be depleted in 2034. After that, about 83% of scheduled benefits would still be payable.

Sequence Risk and 401(k) Loans Near Retirement

Sequence-of-returns risk depends on timing. A market decline in the years just before or just after 67 can do more damage because the account is at its largest and has less time to recover. If withdrawals have already begun, selling during a downturn can lock in those losses.

Outstanding 401(k) loans are another drag on growth. Fidelity says 25.8% of Gen X savers had an outstanding 401(k) loan, compared with 14.0% of Boomers and 19.7% of Millennials. The borrowed money sits outside the market until it is repaid, and the payments come from after-tax income. Some borrowers also reduce contributions while paying the loan back, slowing growth even further.

The One Number to Watch

Among all the variables in this projection, the savings rate is the one workers can control most directly. In the fourth quarter of 2025, 10.7% of Gen X workers on Fidelity’s platform increased their contribution rate. At the median salary used in this model, another percentage point adds about $641 in the first year.

Over 17 years, that change helps explain the gap between the $940,057 and $962,264 balances in the 6% scenario.

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