Age and Risk Profile Overview
Defining risk level
A risk level describes the amount of volatility an investor is willing to accept in pursuit of higher expected returns. In this article three categories are used:
Conservative – primary focus on capital preservation, low volatility assets dominate.
Balanced – mix of growth and stability, moderate volatility.
Aggressive – higher share of growth assets, higher volatility is tolerated.
Relationship between age and investment horizon
Age influences the length of time an investor can remain invested before needing to withdraw funds. A longer horizon generally allows a higher exposure to volatile growth assets because short term market swings can be smoothed out over many years.
Constructing Simple Portfolios
Assumptions
- Expected real return for domestic equities: 5.5 percent per year.
- Expected real return for international equities: 5.0 percent per year.
- Expected real return for aggregate bonds: 2.0 percent per year.
- Standard deviation (annual) for equities: 15 percent.
- Standard deviation for bonds: 5 percent.
- Correlation between equity and bond returns: 0.20.
Portfolio formulas
Expected portfolio return is the weighted sum of individual asset class returns:
Rₚ = Σ wᵢ·Rᵢ where wᵢ is the weight of asset i and Rᵢ its expected return.
Portfolio variance is calculated as:
σ²ₚ = Σ Σ wᵢ·wⱼ·σᵢ·σⱼ·ρᵢⱼ where σᵢ is the standard deviation of asset i and ρᵢⱼ the correlation between assets i and j.
Example portfolios by age
All allocations sum to 100 percent and are expressed in three risk tiers. The numbers are rounded for clarity.
20s
Conservative: 40 % bonds, 55 % equities, 5 % cash.
Balanced: 30 % bonds, 65 % equities, 5 % cash.
Aggressive: 20 % bonds, 75 % equities, 5 % cash.
30s
Conservative: 45 % bonds, 50 % equities, 5 % cash.
Balanced: 35 % bonds, 60 % equities, 5 % cash.
Aggressive: 25 % bonds, 70 % equities, 5 % cash.
40s
Conservative: 50 % bonds, 45 % equities, 5 % cash.
Balanced: 40 % bonds, 55 % equities, 5 % cash.
Aggressive: 30 % bonds, 65 % equities, 5 % cash.
50s
Conservative: 55 % bonds, 40 % equities, 5 % cash.
Balanced: 45 % bonds, 50 % equities, 5 % cash.
Aggressive: 35 % bonds, 60 % equities, 5 % cash.
60s and older
Conservative: 60 % bonds, 35 % equities, 5 % cash.
Balanced: 50 % bonds, 45 % equities, 5 % cash.
Aggressive: 40 % bonds, 55 % equities, 5 % cash.
Practical Implementation Steps
Selecting funds
Choose low cost index funds or ETFs that track the broad market segments used in the model. For domestic equities a total market fund with expense ratio below 0.05 % is typical. International exposure can be achieved with a global ex‑US fund. Bond exposure should be an aggregate bond fund covering government and investment grade corporate bonds.
Rebalancing frequency
Rebalancing when any asset class deviates more than 5 percentage points from its target weight keeps risk aligned with the original profile. The How to Rebalance a Portfolio guide provides a detailed workflow.
Monitoring assumptions
The expected returns and volatilities used here are based on historical real returns over the past 30 years. Investors should review these inputs annually and adjust the model if their personal circumstances or macro‑economic outlook change.
Limitations and Edge Cases
High debt load
When debt service exceeds 30 percent of gross income, the ability to maintain the suggested equity exposure may be constrained. In such cases the cash component can be increased to preserve liquidity.
Low savings rate
If the annual contribution rate is below 5 percent of earnings, the growth impact of the equity portion is reduced. A more conservative allocation may reduce the risk of forced selling during market downturns.
Tax considerations
Tax‑efficient placement of assets (e.g., holding equities in tax‑advantaged accounts) can improve after‑tax returns. The Choosing Between Treasury Bills, CDs, and Money Market Funds for Cash Parking article outlines the tax implications of each short term vehicle.
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