Average 401(k) Balance by Age and Generation: The Complete Data

How does your 401(k) compare to others your age? This page compiles the most current retirement savings data from two authoritative sources: Fidelity Investments' Q4 2025 retirement analysis (covering 24.8 million 401(k) participants across 26,200 plans) and Vanguard's "How America Saves 2025" report (reflecting year-end 2024 data). Together, they provide the clearest available picture of where American retirement savers actually stand.

Average and Median 401(k) Balance by Age

The table below shows the average and median 401(k) balance by age group, based on Vanguard's "How America Saves 2025" report (year-end 2024 data, the most recent age-specific breakdown available).

The gap between average and median is significant at every age and widens as people get older. The overall median of $38,176 is nearly four times lower than the average of $148,153. This means a small number of savers with very large balances are pulling the average up dramatically. The median is the more useful benchmark for most people: it tells you where the midpoint saver actually stands.

Average 401(k) Balance by Generation (Fidelity Q4 2025)

Fidelity's Q4 2025 analysis provides the most up-to-date generational snapshot, covering balances as of December 31, 2025.

Notable findings: Gen X is the only generation with a total savings rate above Fidelity's recommended 15%. Gen Z, the youngest cohort, is starting their savings journey with an average of $13,500, which is actually a strong start given their age. Baby Boomers, despite having the largest average balance, are still well short of the $1.46 million that Americans say they need for a comfortable retirement (Northwestern Mutual, 2026 Planning & Progress Study).

The Power of Consistent Saving: Tenure Data

One of the most powerful statistics in the Fidelity data is how balances grow for people who save consistently in the same plan over time:

These figures are dramatically higher than the overall averages because they represent the compounding effect of consistent contributions over time. A 15-year continuous saver has an average balance of $617,600, more than four times the overall average. This is the single most important takeaway from the data: time in the market and contribution consistency matter far more than timing or picking the right investments.

The Compound Interest Calculator can help you model how your current savings rate will compound over different time horizons.

2026 401(k) Contribution Limits

Fidelity's Savings Milestones by Age

Fidelity Investments publishes widely cited savings milestones based on multiples of salary. These assume a retirement age of 67, a savings rate of 15% of income (including employer match), and a portfolio invested primarily in stocks during working years.

By these benchmarks, the average Gen X saver ($222,100) with a median household income of roughly $75,000 is at about 3x salary at age 45-60. Fidelity's guideline calls for 4-8x salary across that range, suggesting a meaningful gap for the typical Gen X household. The Retirement Calculator can help you model whether your specific savings rate and timeline will close that gap.

What If You Are Behind?

If your 401(k) balance is below the median for your age, you are not alone. The data shows that at least half of American workers are in the same position. The question is what to do about it.

Start with the match. If your employer offers a 401(k) match, contribute at least enough to capture it fully. The most common match structure is 100% of the first 3% and 50% of the next 2% of salary. Not contributing enough to get the full match is leaving free money on the table. As of Q4 2025, 88.1% of Fidelity plan participants received a company match.

Increase contributions by 1% per year. Going from 6% to 15% of salary all at once can feel painful. Going from 6% to 7% is barely noticeable, especially if you time the increase with an annual raise. At 1% per year, you reach the recommended 15% in under a decade. Many plans offer auto-escalation features that do this automatically.

Use catch-up contributions aggressively. If you are 50 or older, the additional $8,000 catch-up in 2026 ($11,250 for ages 60-63 under SECURE 2.0) can make a meaningful dent in a savings shortfall. Maxing out the catch-up contribution for 10 years at a 7% return adds roughly $110,000-$140,000 to your balance.

Stay invested through volatility. According to Fidelity, only 5.4% of 401(k) participants changed their asset allocation in Q4 2025 despite market volatility. The other 94.6% stayed the course. Historical data consistently shows that staying invested through downturns produces better long-term results than attempting to time the market.

For a deeper look at retirement savings strategies and benchmarks, see our retirement savings by age guide and the FIRE Calculator for early retirement planning.

Beyond the 401(k): Total Retirement Savings

A 401(k) is often just one piece of the retirement picture. Many workers also have IRAs, Roth IRAs, brokerage accounts, pensions, or other savings. Fidelity's Q4 2025 data shows average IRA balances by generation alongside 401(k) balances:

For Baby Boomers, IRA balances nearly match 401(k) balances, reflecting decades of rollovers from previous employers. For younger generations, the 401(k) makes up the majority of retirement savings. The overall picture is more complete when you consider total net worth, which includes home equity, taxable investments, and other assets. See our net worth by age data for the full picture, or calculate yours with the Net Worth Calculator.

Related Tools

Plan your retirement with the Retirement Calculator. Model compound growth with the Compound Interest Calculator. Calculate your net worth with the Net Worth Calculator. Explore early retirement with the FIRE Calculator. Check your take-home pay with the Paycheck Calculator. And compare by state with our guide on best states for take-home pay.