Scroll through a menu and you'll see funds named things like "Target Retirement 2065." That year isn't decoration. It's the whole strategy: tell the fund roughly when you plan to retire, and it handles everything else, for decades, without another decision from you.

One fund that holds other funds

A is a fund of funds: a single wrapper holding several broad funds inside it, typically U.S. , international stocks, and . Buy one share and you own a sliver of thousands of companies plus a helping of bonds, already balanced in sensible proportions. For someone who doesn't want to assemble that mix themselves from index funds, it's the entire in one purchase.

The

What makes these funds clever is that the mix doesn't stay fixed. When your target year is 40 years away, the fund holds mostly stocks, because you have decades to ride out drops and stocks are where long-run growth lives. As the year approaches, it gradually shifts toward bonds and steadier holdings, protecting what you've built as you get close to needing it. That slow, automatic shift is called the glide path, and it replaces the and risk-adjusting an investor would otherwise have to remember to do for 40 years straight.

How to pick your year

  1. 1Take the year you were born and add about 65. That's your rough retirement year.
  2. 2Round to the nearest fund offered; they usually come in five-year steps (2055, 2060, 2065).
  3. 3Want to be more aggressive? Pick a later year, which keeps you in stocks longer. More cautious? Pick an earlier one.
  4. 4Buy that one fund and keep contributing. There is no step five.

Fees vary wildly

Two target-date funds with the same year on the label can charge very different prices. Series built from often cost around 0.1% a year, while actively managed versions can charge 0.5% or more for nearly the same ride. Over a career, that gap is real money, the same quiet drain covered in The Quiet Fee That Eats Your Returns. Before you buy, check the , and if your 401(k)'s target-date option is expensive, it may still be worth it for the , but know what you're paying.

Tip
If your job auto-enrolled you in a 401(k), there's a decent chance you already own a target-date fund. It's the most common default investment, which is a compliment: regulators and employers picked it as the option that's hardest to get wrong.

What the year doesn't mean

Two misreadings are worth clearing up. The year is not a lock: your money isn't frozen until 2065, and you can sell or switch funds whenever you want (though inside a retirement account, the account's own withdrawal rules still apply). And the year is not a guarantee: the fund doesn't promise any particular balance when the date arrives. It manages your risk along the way; the market still decides the returns. One more placement note: these funds shine inside retirement accounts, where their internal shuffling has no tax consequences, and they're a little less efficient in a regular taxable .

A target-date fund is designed to be your whole portfolio. Owning three of them, or pairing one with five other funds, cancels the simplicity you're paying for. One fund, fed consistently, is the entire point.