What Your Stock-Bond Mix Should Look Like at 25, 35, and 45

Why 100 Minus Your Age Is Too Rough

Almost every guide to the stock-bond mix by age opens with the same rule: hold your age in bonds and the rest in stocks. We've taken that rule apart in our guide to how much of your portfolio should be in stocks at your age, so here's only the part this guide needs.

The rule assumes your stock share should slide down a little every single year. The professionals don't do that. Vanguard's published glide path for its target-date funds holds 90% stocks and 10% bonds from age 20 until 40, and only then starts easing down, to 50/50 at 65 and a final 30/70 at 72. The line is not a slope. It's a plateau, then a slope.

At 35, the old rule says 65% stocks. Vanguard's default says 90%. That's twenty-five percentage points on the decision that drives most of your outcome, and a plateau means the correct action for most of your thirties is to do nothing at all. The rest of this guide is about what to do instead of fiddling with the mix.

What People in Their 30s Actually Hold

Empower's analysis of its own dashboard data, current to March 31, 2026, found that investors in their 20s, 30s, and 40s all hold a bond allocation of under 5%. That sounds like the setup for a scolding, except the same data turns up something much odder. Investors in their 20s keep 38.7% of their assets in cash, more than any age group except people in their 80s and 90s. In their 30s it's about 28%.

Read the right-hand bar again. The typical person in their 30s isn't running a 90/10 portfolio, or a 65/35 portfolio. They're running something closer to half stocks, a sliver of bonds, and a quarter of everything sitting in a savings account.

That's a cash drag problem wearing a bond problem's clothes.

Say you're 35 with $150,000 across your accounts and 28% of it in cash. That's $42,000 doing very little. As a pure arithmetic illustration, and not a forecast of anything: if that money had compounded at 7% a year instead of 2%, the difference after 20 years is a little over $100,000. Same saver, same contributions, same decade of headlines. The only variable is that a quarter of the portfolio never got invested.

None of that argues for holding zero cash. An emergency fund is not part of your investment mix and shouldn't be counted in it. But three months of expenses is a number. Twenty-eight percent of your net worth is not a number, it's a state of mind, and it usually means money went into the account and never got allocated. If you want to see what the gap looks like on your own figures, our index investing calculator will do the arithmetic faster than a spreadsheet will.

Nationally representative data tells a similar story from a different angle. When the St. Louis Fed looked at the role of age in the stock-bond mix, it found no clean relationship between age and stock holdings at all. In the 2016 Survey of Consumer Finances, households headed by someone under 35 held 40.2% of their financial assets in stocks. Households headed by someone aged 65 to 74 held 50.2%. If anything, the real-world pattern runs backwards from every article ever written on this subject, including this one.

Why Your Age Matters at All

The standard explanation is that young people have "time to recover from a crash." That explanation is popular and mostly wrong, and the better one is worth two minutes.

The St. Louis Fed piece works through it. A long time horizon on its own doesn't justify more stocks. You can change your portfolio any year you like, so your real horizon is the gap between decisions, not the distance to retirement. What does justify it is your job. Your future paychecks are an asset, economists call it human capital, and a salary behaves far more like a bond than like a stock. It shows up on the same day for roughly the same amount.

So a 25-year-old already owns an enormous bond position. It just isn't in the brokerage account. It's the next forty years of earnings.

Holding 90% stocks in the financial portfolio is how you get to a sensible overall balance once you count that in. As your working years run down, that bond-like paycheck shrinks with them, and that's the honest case for a glide path. Your stomach still gets a vote, though. If a 30% drawdown would make you sell, then 90/10 is the wrong portfolio whatever the glide path says. An allocation you can hold through a bad year beats an optimal one you bail out of.

The Fed's article is careful to say this is unsettled research, and that the mismatch between theory and what households do probably means age isn't the only thing driving these decisions. I'd take the same caution into your own plan. The numbers below are a defensible starting point, not a law.

The Mix at 25: 90/10, and Fix the Cash First

First, set the mix and then stop touching it. Ninety percent stocks, ten percent bonds. That's not a bold call, it's the default that Vanguard applies to the millions of people who never make a choice at all, and its 2055-dated fund currently sits at roughly 89% equities and 9% bonds.

The ten percent in bonds does real work even at 25. It gives you something to sell that isn't down when everything else is. That's the entire mechanical purpose of the bond sleeve at this age, and it keeps you in the habit before the habit matters.

But the mix is the second job at this age. The first is making sure the money is actually invested. If you're 25 with money piling up in a savings account because you haven't picked funds yet, arguing about 90/10 versus 80/20 is arranging deck chairs. Our guide to index investing covers the picking-funds part.

Second, decide what counts. Your emergency fund isn't in the allocation. Neither is a house deposit you'll need in three years. Money with a job in the next five years sits outside the portfolio entirely, in cash, and nobody rebalances it.

The Mix at 35: Still 90/10, and Now the Habit Starts

This is the section most guides get wrong, so here it is plainly: at 35, you probably don't need to change anything.

Vanguard's default holds 90/10 all the way to 40. The rule of thumb wants you at 65/35. One of those is a published methodology backing a fund that people actually retire on, and the other is a sentence that rhymes. If you were 90/10 at 25 and you're 35 now, the correct action on your equity allocation is none.

What does change at 35 is drift. Ten years of a decent run and a portfolio you set at 90/10 might now be 95/5, because the stock side grew faster. You didn't decide to take more risk. The market decided for you. Rebalancing is what fixes that, and 35 is roughly when the balances get big enough for the drift to be worth a calendar reminder.

If you want a reason to hold bonds beyond the mechanics, the role bonds play in a diversified portfolio is worth understanding properly rather than taking on faith, and the main types of bonds differ more than the single word suggests.

The Mix at 45: The Glide Path Finally Begins

Third, start easing down, slowly. Vanguard's glide path starts reducing stocks at 40 and reaches 50% stocks at 65, which puts a 45-year-old at roughly 82% stocks and 18% bonds if you draw a straight line between them. Call it 80/20. Nobody can measure the difference between 82 and 80 in an outcome.

This is the answer to when to add bonds to your portfolio: around 40, and then about a point and a half a year until retirement. Not in a lump. Not when the news gets bad. On a schedule that ignores the news entirely.

Put real money against it. You're 45 with $400,000 in a 401(k) and a target of 80/20. After a strong year, stocks have grown to 87% of the balance, or $348,000, with $52,000 in bonds. Your target says $320,000 and $80,000. You're $28,000 off.

You could sell $28,000 of stocks and buy bonds with it. Inside a target date fund, or any tax-deferred account, that costs nothing in tax and takes about ninety seconds. Or you could sell nothing at all. That's usually the better move, and the next section explains why.

How to Rebalance Inside a 401(k) Without Selling Anything

The SEC's beginners' guide to asset allocation lists three ways to rebalance, and most people only know the first one.

1. Sell the overweight, buy the underweight. The obvious method. Fine in a 401(k) or IRA. In a taxable brokerage account it can create a capital gains bill, so check before you click.
2. Buy the underweight with new money. Don't sell anything. Just put fresh contributions into whatever is below target until the percentages line up again.
3. Redirect your future contributions. The same idea, set once. Change the allocation of new payroll contributions in your plan settings and let the next several months of paychecks do the rebalancing for you.

Method three is the quiet winner for anyone still working. Back to the 45-year-old above: at $2,000 a month of combined contributions and employer match, pointing that $24,000 a year at bonds closes most of a $28,000 gap inside twelve months. You sell nothing, you owe nothing, and you never have to make the call in a week when the market is moving.

One form change a year. That's the entire maintenance burden.

The One Rule: Once a Year, Then Stop Looking

Pick a date. Your birthday, January 2nd, whatever you'll remember. Check the percentages. If anything is more than five points from target, fix it, preferably with the contribution redirect. Then close the tab for twelve months.

The SEC's guidance is that rebalancing "tends to work best when done on a relatively infrequent basis," and suggests every six or twelve months. Vanguard's own research lands in the same place, finding that neither monthly checking nor rebalancing every couple of years beats an annual cadence for most investors, mainly because frequent rebalancing costs more in trading and effort without buying you better risk-adjusted results.

There's a behavioral reason too, and I think it matters more than the arithmetic. Annual rebalancing makes you sell what has done well and buy what hasn't. That is the exact opposite of what you will feel like doing, every single time. Put bluntly, it forces you to buy low and sell high. Working from a calendar means you never have to decide whether now is the moment, and "is now the moment" is the question that ruins portfolios.

For a fuller walkthrough of the mechanics, our guide to portfolio rebalancing goes further than this section does.

One more thing worth saying out loud. If reading all of this makes you want to skip it, buy a target date fund and be done. It does every step above automatically, and a fund that runs the right glide path without your involvement beats a spreadsheet you'll abandon in fourteen months.

In Summary

The right stock-bond mix for your age fits on an index card, and this is the whole card:

• At 25, hold roughly 90% stocks and 10% bonds. The bigger job at that age is making sure the cash is invested at all.
• At 35, hold roughly 90/10 still. Change nothing about the target and start checking once a year for drift.
• At 45, begin easing toward 80/20, then keep easing by about a point and a half a year.
• Every year, check the percentages once. If anything sits more than five points off target, redirect new contributions rather than selling.
• Never change the mix because of a headline or a bad quarter.

Get the allocation roughly right and then leave it alone, because the gap between a good mix and a perfect one is small, and the gap between a good mix and no mix at all is about a hundred thousand dollars.