Glide Path Retirement Planning: How to Adjust Asset Allocation by Age

The concept comes from target-date funds, which automatically adjust their asset mix over time. A typical glide path might start at 90% stocks / 10% bonds for a 25-year-old and shift to 40% stocks / 60% bonds by retirement.

The rationale is simple: early in your career, you have decades to recover from market downturns, so you can afford more volatility for higher expected returns. As retirement approaches, preserving capital becomes more important than maximizing growth.

Glide paths can be "to" retirement (reaching most conservative allocation at retirement) or "through" retirement (continuing to adjust allocation during retirement years).

Common glide path benchmarks:

• Age 25–35: 80–90% stocks, 10–20% bonds
• Age 35–45: 70–80% stocks, 20–30% bonds
• Age 45–55: 60–70% stocks, 30–40% bonds
• Age 55–65: 40–60% stocks, 40–60% bonds
• Age 65+: 30–50% stocks, 50–70% bonds

The old "age in bonds" rule (e.g., 40 years old = 40% bonds) is now considered too conservative given longer lifespans. Modern guidance suggests "age minus 10" or "age minus 20" in bonds.

Vanguard's target-date funds, for example, reach 50/50 stocks/bonds at retirement and continue gliding to 30/70 seven years later.

Research by Michael Kitces and Wade Pfau showed that the highest-risk period for retirees is the 5–10 years surrounding retirement. A bear market during this window can permanently impair portfolio longevity.

A bond tent addresses this by:

1. Increasing bond allocation to 60–70% as you approach retirement
2. Maintaining that conservative allocation for the first 3–5 years of retirement
3. Gradually shifting back toward 50–60% equities as you move through retirement

This counterintuitive strategy works because once you survive the early retirement years without a devastating drawdown, your remaining timeline is shorter and your portfolio has had time to grow.

Building your own glide path:

Step 1: Determine your equity starting point based on risk tolerance (80–100% for aggressive, 60–70% for moderate).

Step 2: Set your retirement equity target (30–50% for most people).

Step 3: Calculate the annual reduction needed. If you have 30 years and need to go from 90% to 40% stocks, that's roughly 1.7% per year.

Step 4: Adjust for other income. If you expect a pension or Social Security covering 40% of expenses, you can afford a higher equity allocation in retirement since you're less dependent on portfolio withdrawals.

Step 5: Consider a bond tent if you're within 10 years of retirement.

Rebalance annually to stay on your glide path. Use our Early Retirement Calculator to model how different allocations affect your retirement timeline.

Mistake 1: Going too conservative too young. A 40-year-old with 50% bonds sacrifices decades of equity growth. With 25+ years to retirement, you can weather significant volatility.

Mistake 2: Stopping the glide path at retirement. Your portfolio may need to last 30+ years in retirement. Going 100% bonds at 65 risks outliving your money due to inflation erosion.

Mistake 3: Ignoring longevity. If you retire at 60 and live to 95, that's 35 years — you need growth assets to maintain purchasing power.

Mistake 4: Panic selling during downturns. A glide path only works if you follow it. Selling stocks after a crash locks in losses and defeats the purpose.

Mistake 5: Not accounting for other income sources. A generous pension allows a more aggressive equity allocation since you're less reliant on portfolio withdrawals.