"Hold your age in bonds" is one of the most famous rules in retirement planning. If you're 60, hold 60% bonds and 40% stocks. Simple, memorable, and... increasingly questionable.
Modern research shows that the optimal asset allocation path through retirement is far more nuanced than a simple age-based rule. In fact, some of the most successful retirement strategies do the opposite: start conservative and get MORE aggressive as you age.
This guide will show you the latest thinking on asset allocation throughout retirement, including glide path strategies that can increase your success rate by 5-10 percentage points compared to traditional approaches.
A glide path is a predetermined plan for how your asset allocation will change over time—specifically, how your stock/bond mix shifts as you move through retirement.
Traditional thinking (declining equity glide path):
Logic: As you age, you have less time to recover from market crashes, so reduce risk by holding more bonds.
The problem: This approach front-loads sequence risk (the danger of early crashes) and back-loads longevity risk (running out of money in your 80s-90s because bond returns can't keep up with inflation).
Recent research from Wade Pfau, Michael Kitces, and others shows that a rising equity glide path—starting conservative and increasing stocks over time—performs better for many retirees.
How it works:
Why this works:
Historical performance: Rising equity glide paths increase success rates by 5-10 percentage points compared to static allocations, especially for 4%+ withdrawal rates.
(Learn more about sequence of returns risk)
Think of retirement in three phases, each with different asset allocation goals:
Primary goal: Survive the fragile decade without depleting your portfolio during a market crash.
Recommended allocation:
Why bonds matter here: Bonds provide cash flow for withdrawals during stock market crashes, allowing your equities to recover without forced selling.
Alternative: Keep 2-3 years of expenses in cash/short-term bonds (a "cash buffer"), then invest the rest more aggressively. This gives you dry powder during crashes.
Primary goal: Ensure your portfolio can sustain another 15-20+ years of withdrawals.
Recommended allocation:
Why increase stocks? If you've made it to 70 with your portfolio intact, congratulations—you survived sequence risk. Now you need growth to combat inflation and longevity risk.
Risk consideration: Yes, you're older and "should" be more conservative. But the math says otherwise—a 75-year-old with a healthy portfolio needs 20+ years of returns, not 5.
Primary goal: Don't run out of money, but also don't sit on $2M in bonds earning 4% while living on cat food.
Recommended allocation:
Why still hold stocks? Even at 85, you might live to 100. That's 15 years. A 100% bond portfolio will slowly erode due to inflation, potentially leaving you broke in your 90s.
Legacy consideration: If you have more money than you can spend, increase stock allocation to maximize wealth transfer to heirs (who have decades to ride out volatility).
The rising equity glide path is often called a "bond tent" because bond allocation is highest at retirement, then declines over time.
Visual representation:
```
Bond Allocation %
60% | /\
| / \
50% | / \
| / \
40% | / \___________
| /
30% | /
| /
20% |__/
60 65 70 75 80 85 Age
```
The tent peak (ages 60-70): Maximum bond allocation, minimum sequence risk
The tent sides (ages 70-85): Gradual increase in stocks, shift from stability to growth
Pre-determined, doesn't change based on market conditions.
Example: "I will hold 50/50 at age 65, 60/40 at age 72, 70/30 at age 80, regardless of what markets do."
Pros: Simple, no decision-making required
Cons: Ignores market conditions (you might increase stocks right before a crash)
Adjusts based on portfolio value and market performance.
Example: "I will target 50/50, but if my portfolio grows to 130% of expected value, I'll shift to 60/40 early. If it drops to 80% of expected, I'll stay at 50/50 longer."
Pros: More responsive, avoids increasing risk after crashes
Cons: Requires monitoring and discipline
Best practice: Start with a static target glide path, but give yourself flexibility to delay equity increases if markets crash.
If you want a simple starting point before doing deep optimization, here are three frameworks:
Best for: Ultra-conservative retirees, very low risk tolerance, large pensions covering most expenses
Best for: Moderate risk tolerance, 30-year time horizon, no pension
Best for: Retirees with spending flexibility, willing to cut expenses in down markets, focused on longevity risk
Generic age-based rules ignore critical personal factors:
Age is a proxy for time horizon, but it's not the only factor. A healthy 70-year-old with $2M and $40k/year spending has a 30-40 year horizon. They need growth, not 80% bonds.
Allocations should evolve. Rebalance annually and adjust your glide path based on portfolio performance, health changes, and spending needs.
A 60-year-old who retires with $50k/year in spending will need $90k+/year by age 85 (assuming 3% inflation). Bonds alone can't keep pace—you need equity growth.
The worst time to reduce stock allocation is after a 30% crash. You've locked in losses. Better: Stick to your glide path or (if you have cash reserves) rebalance by BUYING stocks at depressed prices.
"If I'd held 90% stocks in 2010, I'd have 3x my money!" True. But you didn't know 2010-2020 would be a bull market. Allocations must be robust to FUTURE uncertainty, not optimized for PAST outcomes.
Step 1: Choose Your Path Type
Step 2: Set Your Starting Allocation
Based on risk tolerance, time horizon, and other income.
Step 3: Define Checkpoints
Plan allocation changes every 5 years (or every 10 years for slower glide paths).
Example:
Step 4: Rebalance Annually
Markets will push you off target. Rebalance each year to maintain your intended allocation.
Step 5: Review Every 5 Years
Life changes. Spending changes. Markets change. Reassess your glide path and adjust if needed.
Don't guess—model it. Monte Carlo simulation lets you test different glide paths across thousands of market scenarios.
What to compare:
Key metrics:
QuantCalc's retirement planner lets you model:
You'll see exactly which glide path maximizes your success probability and ending wealth for your specific situation.
Asset allocation isn't just about age—it's about time horizon, risk tolerance, spending flexibility, and income sources.
The rising equity glide path (bond tent) is a powerful tool for managing sequence risk while preserving long-term growth. But it's not right for everyone—some retirees need stability throughout retirement, others can handle volatility.
Test your options with Monte Carlo simulation. See what actually works for YOUR portfolio, YOUR spending, YOUR risk tolerance.
Ready to optimize your retirement asset allocation? Model your glide path with QuantCalc and find the strategy that maximizes your success probability.
Further Reading:
Run Monte Carlo simulations with up to 10,000 scenarios using institutional forecasts from BlackRock, JPMorgan, Vanguard, and GMO.
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