Asset Allocation by Age: A Practical Framework
A practical, decade-by-decade map of how your stock/bond mix should evolve, the logic behind the glide path, and why the old age-in-bonds rule needs updating.
Don't have time? Here's what you need to know:
- 1Shift gradually from mostly stocks in your 20s toward more bonds in your 50s-60s to manage sequence-of-returns risk.
- 2The age-in-bonds rule is now seen as too conservative; 110 or 120 minus age in stocks is a common modern update.
- 3Even at retirement, holding 40-60% stocks helps protect against inflation over a 30-year retirement.
- 4Implement any glide path with VTI, VXUS, and BND, or delegate it to a target-date index fund.
The Glide Path: Why Allocation Shifts With Time
Asset allocation by age rests on a simple idea: the closer you are to spending your money, the less time you have to recover from a market crash, so you should gradually shift from growth-oriented stocks toward steadier bonds. This downward-sloping path of equity exposure over a lifetime is called a glide path, and it is the engine inside every target-date retirement fund.
The reason is sequence-of-returns risk. A 50% stock decline barely dents a 28-year-old who keeps contributing for decades, the crash simply lets them buy cheaply. The same decline in the first year of retirement, when you are selling shares to live on, can permanently impair a portfolio. De-risking with age protects you precisely when a bad market would do the most damage.
The Old Rule and Why It Needs Updating
The traditional rule of thumb was to hold a percentage of bonds equal to your age: 30% bonds at 30, 60% at 60. It is memorable and roughly sensible, but it is widely viewed as too conservative for today's longer retirements. Someone retiring at 65 may need their portfolio to last 30 years or more, which requires meaningful stock exposure well into retirement to keep pace with inflation.
Many practitioners now use a more aggressive variant, such as holding 110 or 120 minus your age in stocks. At 40, that points to 70% to 80% in stocks rather than the older rule's 60%. The right number depends on your savings rate, other income like a pension or Social Security, and your stomach for volatility, but the modern consensus leans toward holding more equities for longer than the age-in-bonds rule suggests.
Tip: Treat any age rule as a starting point, not gospel. A larger safety margin from a pension or paid-off home lets you hold more stocks; a thin cushion argues for fewer.
A Decade-by-Decade Framework
The table below sketches a reasonable glide path for a typical investor retiring in their mid-60s. It is illustrative, not prescriptive, your own numbers should flex with your circumstances. Notice that the shift is gradual and that even at retirement a substantial stock allocation remains to fight inflation over a long retirement.
| Life stage | Stocks | Bonds | Primary goal |
|---|---|---|---|
| 20s | 90-100% | 0-10% | Maximize growth, ride out volatility |
| 30s | 80-90% | 10-20% | Aggressive accumulation |
| 40s | 70-80% | 20-30% | Growth with a growing cushion |
| 50s | 60-70% | 30-40% | Begin de-risking toward retirement |
| 60s / early retirement | 50-60% | 40-50% | Protect against early-retirement losses |
| 70s+ | 40-50% | 50-60% | Income and capital preservation |
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Building the Glide Path With ETFs
You can implement any of these allocations with a handful of funds. A total U.S. stock fund like VTI, an international fund like VXUS, and a total bond fund like BND cover the essentials. To shift your allocation over time, you simply raise the bond percentage every few years as you move into a new life stage.
If you would rather not manage the glide path yourself, a single target-date index fund does it automatically, holding a diversified mix and de-risking on a set schedule tied to your retirement year. The trade-off is slightly less control and sometimes a marginally higher fee than a do-it-yourself three-fund build. Either approach beats the common mistakes of staying 100% in stocks into your 60s or, worse, being too conservative in your 20s.
Important: Avoid being too conservative when young. Holding heavy bonds in your 20s can cost you years of compounding that you will never fully make back.
Frequently Asked Questions
How much should a 30-year-old have in stocks?
Most frameworks put a 30-year-old somewhere between 80% and 100% in stocks, given a multi-decade horizon. The old age-in-bonds rule would suggest 70% stocks, but that is now widely seen as too conservative for someone with 35-plus years until retirement. A 90/10 or even all-stock allocation is common and defensible at this age if you can hold through downturns.
Should I still hold stocks after I retire?
Almost always yes. A retirement can last 30 years, and an all-bond portfolio risks being eroded by inflation over that span. Many retirees hold 40% to 60% in stocks to keep their purchasing power growing, while leaning on bonds and cash for near-term spending. The exact mix depends on your other income sources and spending needs.
What is a glide path?
A glide path is the schedule by which your stock allocation declines, and your bond allocation rises, as you age toward and through retirement. Target-date funds use a built-in glide path, automatically becoming more conservative each year. You can replicate one manually by raising your bond percentage in steps as you move through each decade.
Is the rule of 100 minus your age outdated?
It is a reasonable starting point but is now often considered too conservative. Many advisors prefer 110 or 120 minus your age for the stock percentage, reflecting longer lifespans and the need for inflation-beating growth. Adjust based on your risk tolerance, savings rate, and guaranteed income such as pensions or Social Security.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.