How to shift from growth-heavy to income-stable as retirement approaches — target-date funds vs DIY glide paths.
In this lesson you'll learn
Why asset allocation must change as retirement approaches
How the glide path shifts from stocks to bonds over time
The classic and updated allocation formulas by age
How target-date funds automate the glide path for you
The ongoing debate about bonds and what to use instead
Why Asset Allocation Changes Over Time
When you're 25, a 40% market drop is painful but recoverable — you have 40 years for the market to come back. When you're 63, a 40% drop one year before retirement is catastrophic — you may need to sell depressed assets to live on.
This is called sequence of returns risk: the order in which returns occur matters enormously when you're withdrawing money. A bad early sequence (like a crash in year 1 of retirement) can permanently impair a portfolio even if the long-run average return is fine.
Age 25–45
Accumulation Phase
You're adding money every month. Market drops are buying opportunities. High stock allocation (80–90%) is appropriate — volatility is your friend.
Age 45–60
Transition Zone
Retirement is visible on the horizon. Gradually shift toward bonds. A 40% market drop here is recoverable but painful — start reducing exposure.
Age 60+
Distribution Phase
You may be withdrawing money within 5 years. Stability matters more than growth. A large crash right before or after retirement can permanently deplete savings.
The Glide Path Concept
A glide path is the gradual shift in your portfolio allocation from high-growth (stocks) toward high-stability (bonds and cash) as retirement approaches. Think of it as a landing path — you start high and fast, and smoothly descend as you approach the runway.
The chart shows a typical glide path: stocks start at ~90% at age 25, smoothly declining to ~50% at retirement, then ~40% by 70. Bonds rise correspondingly, and a small cash/short-term allocation appears near retirement.
Rule of Thumb Formulas by Age
Several simplified formulas exist to guide allocation. None is perfect, but they provide a useful starting point:
Classic: Bonds % = Your Age
At age 40 → 40% bonds. Developed decades ago when life expectancy was shorter. Often considered too conservative for modern retirees with 30-year retirements.
Updated: Bonds % = Age − 20
At age 40 → 20% bonds. Better reflects longer life expectancy and the need to keep assets growing into a 30-year retirement.
Aggressive: Stocks = 120 − Age
At age 40 → 80% stocks. Good for investors with high risk tolerance, other income sources (pension, real estate), or a flexible retirement timeline.
Age
Traditional (= age)
Updated (age − 20)
Aggressive (120 − age)
30
30% bonds
10% bonds
90% stocks
40
40% bonds
20% bonds
80% stocks
50
50% bonds
30% bonds
70% stocks
60
60% bonds
40% bonds
60% stocks
70
70% bonds
50% bonds
50% stocks
These are simplifications — actual allocation should factor in risk tolerance, other income sources (pension, Social Security, rental income), health, and personal time horizon. A financial advisor can build a more personalized glide path.
Target-Date Funds — The Simple Solution
Target-date funds (e.g., Vanguard Target Retirement 2050, Fidelity Freedom 2050, Schwab Target Date 2050) automatically shift allocation as the target year approaches. You pick the fund closest to your expected retirement year and never rebalance manually.
Pros
Automatic glide path — no manual rebalancing needed
Globally diversified in a single holding
Low cost at major index-fund providers
Perfect 'set it and forget it' solution
Cons
✗One-size-fits-all — your personal situation may differ
✗You can't customize the stock/bond split
✗Holds bonds even when you might prefer to stay in stocks
✗Actively managed versions can charge 0.5–1.0% — avoid these
Fidelity Freedom Index (e.g., FDKLX)~0.12%Excellent
Schwab Target Date Index~0.08%Excellent
Actively managed target-date funds0.5–1.0%Avoid
The Bond Allocation Debate
Bonds have underperformed since 2010 and suffered historic losses in 2022 when interest rates rose sharply. Many investors began questioning whether bonds still belong in a retirement portfolio. Here's a balanced view:
The case FOR keeping bonds
1.
Shock absorber during equity crashes
In 2008, stocks fell ~50% while investment-grade bonds rose. Rebalancing — selling bonds to buy depressed stocks — let investors recover dramatically faster. This negative correlation is the core value of bonds in a portfolio.
2.
Short-term stability for money you'll need soon
Money you need in 1–5 years should NOT be in stocks regardless of age. If you plan to retire in 3 years, that money should be in stable, lower-risk assets.
Alternatives to traditional intermediate-term bonds
→
I-Bonds (Treasury inflation-protected, up to $10k/year) — Inflation-indexed, no credit risk, held directly at TreasuryDirect.gov
→
Short-term Treasuries (1–3 year maturities) — Lower duration risk than long bonds; currently offering competitive yields
→
TIPS (Treasury Inflation-Protected Securities) — Principal adjusts with CPI — real purchasing power is preserved
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High-Yield Savings / Money Market for the cash portion — No duration risk; currently 4–5% yield for the truly short-term bucket
Quick Knowledge Check
3 questions · test what you've just learned
1
You are 55 years old. Using the 'age minus 20' rule, what percentage should be in bonds?
2
What is the main advantage of a target-date fund for retirement saving?
3
Why is a 60% stock / 40% bond portfolio considered more conservative than 90% stock / 10% bond?
Key takeaways from Lesson 7
Sequence of returns risk means allocation must shift from growth to stability as retirement approaches.
A glide path gradually reduces stocks and increases bonds/cash from your 40s through retirement.
The updated rule-of-thumb: bonds % = age − 20 (better than the classic 'bonds = age' for modern longevity).
Target-date funds automate the glide path at very low cost — ideal for most investors.
Bonds provide crash protection and short-term stability, even if their long-run returns disappoint.
Alternatives like I-Bonds, short-term Treasuries, and TIPS can supplement or replace traditional bond funds.