1. The one number that sets your risk
Quick Answer: Most people spend their energy picking funds. The bigger lever is the stock-versus-bond split sitting above those funds. Move from 100% bonds to 100% stocks and the worst single year in nearly a century goes from a 8.1% loss to a 43.1% loss on the same dollar.
Search “asset allocation by age” and you get a wall of tables. They rarely agree, and almost none of them say what the disagreement means for you.
This guide does something different. It lines up the common age rules side by side, so you can see how far apart they sit. It puts a dollar figure on what each mix has cost in its worst year. Then it shows what savers in their late 50s and 60s are actually holding right now, which looks nothing like the tables.
Every number here traces to a named public source, which is the standard behind every investing guide we publish at DollarVisor. No company pays for placement in anything you read here.
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If you want the concept explained out loud before the numbers start, this short walkthrough covers it well.
2. What is asset allocation, exactly?
Quick Answer: Asset allocation is how you divide your money across broad asset classes, mainly stocks, bonds and cash. It is usually written as a pair of numbers, like 80/20, meaning 80% stocks and 20% bonds. It is a different job from diversification, which is how you spread money inside each class.
Three terms get mixed up constantly, so here they are apart:
| Term | What it decides |
|---|---|
| Asset allocation | How much sits in stocks versus bonds versus cash |
| Diversification | How widely you spread money inside each of those buckets |
| Rebalancing | Pulling the mix back to target after markets move it |
The SEC’s beginners’ guide treats all three as one set of habits, and that is the right way to hold them. You choose a mix, you fill each bucket with something broad like an index fund or ETF, and then you drag it back to target when it drifts.
Cash belongs in the conversation too, but it works differently. Money you need inside three years is not really part of your asset allocation at all. It is a bill waiting to happen, and it belongs somewhere safe.
3. What do the age rules actually give you?
Quick Answer: Three rules of thumb are in common use: 100 minus your age, 110 minus your age, and 120 minus your age. Each gives your stock percentage. At every age they sit exactly 20 percentage points apart, so the “rule” is really a 20-point band.
| Age | 100 minus age | 110 minus age | 120 minus age | Spread |
|---|---|---|---|---|
| 25 | 75% | 85% | 95% | 20 pts |
| 35 | 65% | 75% | 85% | 20 pts |
| 45 | 55% | 65% | 75% | 20 pts |
| 55 | 45% | 55% | 65% | 20 pts |
| 65 | 35% | 45% | 55% | 20 pts |
| 75 | 25% | 35% | 45% | 20 pts |
Source: DollarVisor calculation from three published rules of thumb. Bonds take the remainder.
A 45-year-old is told to hold 55% stocks, or 65%, or 75%, depending on which article loaded first. On a $300,000 portfolio that is a $60,000 swing in how much is exposed to the stock market.
None of the three is wrong. The rule of 100 came from an era of shorter retirements; the rule of 120 assumes a long one, funded partly by growth that keeps running well past your last paycheck. If you have already modeled how much you need to retire, you know which assumption is closer to yours.
4. What does each mix cost you in a bad year?
Quick Answer: Using Vanguard’s historical data from 1926 to 2019, an all-stock portfolio lost 43.1% in its worst calendar year. A 60/40 mix lost 26.6%. A 20/80 mix lost 10.1%. On $100,000 that is the difference between a $43,100 hole and a $10,100 one.
| Mix | Worst year | On $100,000 | Best year | Average |
|---|---|---|---|---|
| 100/0 |
−43.1% |
−$43,100 | 54.2% | 10.3% |
| 80/20 |
−34.9% |
−$34,900 | 45.4% | 9.6% |
| 60/40 |
−26.6% |
−$26,600 | 36.7% | 8.8% |
| 40/60 |
−18.4% |
−$18,400 | 27.9% | 7.8% |
| 20/80 |
−10.1% |
−$10,100 | 29.8% | 6.6% |
| 0/100 |
−8.1% |
−$8,100 | 32.6% | 5.3% |
Source: Vanguard historical risk and return data, 1926–2019, via Visual Capitalist. Dollar column is DollarVisor’s calculation.
Read the worst-year column as a stress test rather than a forecast. It is one calendar year, mostly 1931, and it is the number people quote after the fact. What matters is whether you would have kept buying the following January.
Notice something else. Moving from 100% stocks down to 60/40 cuts the worst year almost in half but only costs 1.5 percentage points of average return. That trade gets much worse further down the table. Vanguard’s own model portfolio guidance makes the same point: the mix drives the range of outcomes more than anything else in the portfolio.
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5. Age is standing in for two things it cannot measure
Quick Answer: Age is a proxy for two separate things: how many years until you spend the money, and how much of a loss you can absorb without changing your plans. Two 50-year-olds can differ enormously on both, which is why one age can support very different asset allocation choices.
Vanguard says this plainly on its own education page: allocation decisions are driven by time horizon and risk tolerance, not age alone. Worth separating the pieces:
- Time to the money. Not your age, but the years until each dollar gets spent. A 60-year-old with a pension covering the bills may not touch their portfolio for 15 years.
- Capacity to take a loss. Stable income, low fixed costs and cash on hand all raise it. A commission-based income lowers it, whatever your age.
- Willingness to take a loss. How you behaved in the last drawdown, not how you imagine you would behave in the next one.
Capacity and willingness pull apart more often than people expect. A tenured 35-year-old with a large emergency reserve has high capacity, and may still panic-sell at a 20% drop. The right asset allocation is set by whichever of the two is lower, because a plan you abandon is not a plan.
That is also the honest case for automating the decision. If picking a number is what stops you from starting, a single fund or a robo-advisor that holds the mix for you beats a perfect allocation you never implement.
6. What savers over 55 actually hold
Quick Answer: Among Vanguard retirement plan savers aged 55 and over in 2024, roughly half were in a professionally managed option that held a recognizable mix. The other half picked their own, and their stock exposure was scattered: 6% held no stocks at all and 7% held nothing but stocks.
| How they invest | Share of 55+ | Typical stock exposure |
|---|---|---|
| Someone else holds the mix | ||
| Single target-date fund | 41% | 41–70% |
| Managed account | 9% | 51–80% |
| Single balanced fund | 1% | 51–70% |
| They picked it themselves | ||
| Self-directed, all outcomes | 49% | Widely scattered |
| Holding no stocks at all | 6% | 0% |
| Holding nothing but stocks | 7% | 100% |
Source: Vanguard, How America Saves 2025, 2024 plan-year data.
Two people the same age, in the same plan, sitting at 0% and 100% stocks. No age table produces that. It happens because the self-directed half never revisited a choice made years ago.
Across all ages, Vanguard reported that 67% of participants were in a professionally managed allocation at the end of 2024. If you hold your 401(k) in a single dated fund, your mix is already being adjusted for you and the table above is a sanity check, not a to-do list.
7. What playing it safe costs over 30 years
Quick Answer: Compound $10,000 at each mix’s long-run average and the gaps get large. At the 1926–2019 averages, 30 years turns $10,000 into about $189,000 at 100% stocks and about $47,000 at 100% bonds. Being cautious has a price, and it is paid slowly.
| Mix | Rate used | Year 10 | Year 20 | Year 30 | Gap vs 100% stocks |
|---|---|---|---|---|---|
| 100% stocks | 10.3% | $26,654 | $71,041 | $189,350 | : |
| 60/40 | 8.8% | $23,243 | $54,023 | $125,564 | −$63,786 |
| 40/60 | 7.8% | $21,193 | $44,913 | $95,184 | −$94,166 |
| 20/80 | 6.6% | $18,948 | $35,904 | $68,032 | −$121,318 |
| 100% bonds | 5.3% | $16,760 | $28,091 | $47,082 | −$142,268 |
Modeled scenario. DollarVisor calculation using Vanguard 1926–2019 average returns. Nominal, no fees or taxes.
Treat this as a shape, not a promise. Nobody earns the long-run average in a straight line, the figures are before inflation and fees, and bond returns over the next 30 years will start from today’s yields, not 1926’s.
The shape is still the point. A 30-year-old choosing 20/80 because a market drop sounds frightening is trading away most of the growth in the table to avoid a loss they have three decades to recover from. That same choice at 68 is reasonable. Money you will spend soon belongs in a high-yield savings account, not in an allocation debate.
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8. How to set your asset allocation in five steps
Quick Answer: Carve out near-term cash first, then use an age rule to find your band, then move within that band based on your real capacity for loss. Fill the buckets with broad funds, write the target down, and check it once a year.
Five steps, in order. Most of the work is in the first two.
- Take out the money you need soon. Anything you will spend inside three years leaves the portfolio entirely and goes into cash or short-term savings.
- Find your band. Subtract your age from 110 for the middle of the range, then add or subtract 10 for the aggressive and conservative ends.
- Pick your point in the band. Stable income and a funded cash reserve push you toward the top. Variable income, big fixed costs or a history of selling in downturns push you to the bottom.
- Fill the two buckets. A broad total-market stock fund and a broad bond fund cover it. Treasury bonds and bond funds both work for the fixed-income side.
- Write the target down and set a check date. One date a year. That note is what stops you from renegotiating your mix in the middle of a bad week.
Step five is where most plans quietly fail. When you check, you are looking for drift, and there is a specific way to fix it without overtrading, which we cover in our guide on how and when to rebalance your portfolio.
9. Our asset allocation models by age
Quick Answer: Our verdict: use 110 minus your age as the center of your stock share, and treat 10 points either side as your working range. Hold the low end only if a 30% drop would change what you actually do. These are starting points to adjust, not prescriptions.
| Age | Center (stocks) | Working range | Go to the low end if |
|---|---|---|---|
| 25–34 | 80% | 70–90% | Income is irregular or the cash reserve is thin |
| 35–44 | 70% | 60–80% | A house or tuition lands within five years |
| 45–54 | 60% | 50–70% | You plan to stop working before 60 |
| 55–64 | 50% | 40–60% | Withdrawals start within three years |
| 65–74 | 40% | 30–50% | The portfolio covers most of your monthly bills |
| 75+ | 30% | 20–40% | You are not leaving the money to anyone |
Look at the 55–64 row against what those savers actually hold. Per the Vanguard data in Section 6, the professionally managed options in that group cluster around 41% to 70% stocks, which brackets our 40–60% range fairly closely. The self-directed half is the group with a decision to make.
One warning about the 65+ rows. A 40% stock allocation at 65 is not caution, it is a bet that your money has to last 25 more years. Cutting it further to feel safe is a different bet, that inflation will not outrun you. Both are bets. We publish how we build every number so you can disagree with ours on the evidence.
10. Frequently Asked Questions
1. What is a good asset allocation by age?
A reasonable center is 110 minus your age in stocks, with the rest in bonds. That gives roughly 80% stocks at 30, 65% at 45, and 45% at 65. Treat 10 points either side as your working range, and choose the lower end if your income is unstable or withdrawals start within a few years.
2. Is the 100 minus age rule still valid?
It still works, but it is the most conservative of the three common rules. It was built around shorter retirements. If you expect to spend 25 or 30 years drawing on the portfolio, 110 or 120 minus your age keeps more growth working, which matters when the money has to outlast you.
3. What is the difference between asset allocation and diversification?
Asset allocation is how much you hold in stocks versus bonds versus cash. Diversification is how widely you spread money inside each of those. You can be perfectly diversified across 3,000 stocks and still have an allocation that is far too aggressive for your situation.
4. How often should I change my mix?
Check once a year and after any large life change, such as a new job, a house purchase or a retirement date moving. Between those checks, the only reason to trade is drift away from your written target. Market news is not a reason.
5. Does a target-date fund handle this for me?
Yes, if you hold one as your only investment. It sets a mix, shifts it gradually as the date nears, and rebalances for itself. Vanguard reported 67% of its plan participants in a professionally managed option at the end of 2024. Holding one alongside several other funds undoes the design.
This article is for general information and is not financial advice. See our full disclaimer.
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