Asset allocation — how you split your money between stocks, bonds, and other assets — is the single most important investing decision you will make. It will explain more of your long-term return than any individual stock pick, fund choice, or market-timing decision. Here’s a framework that works at any age and ages with you.
This piece is educational. Personal investment decisions depend on your full financial picture; consult a qualified advisor before making large allocation changes.
What asset allocation actually decides
Asset allocation determines two things:
Expected return. Stocks have averaged roughly 7% real returns over very long horizons. Bonds have averaged 1–3%. The more stocks you own, the higher your expected long-term return.
Volatility. Stocks routinely drop 30–50% in a single year. Bonds rarely drop more than 10–15%. The more stocks you own, the more your portfolio will swing — which matters for retirees withdrawing money and for anyone who might panic-sell at a bottom.
The right allocation balances “I need this money to grow” against “I cannot afford to watch it crater right when I need it.”
The classic age-based framework
The simplest rule of thumb most advisors use is “110 minus your age” in stocks, with the rest in bonds:
| Age | Stocks | Bonds |
|---|---|---|
| 25 | 85% | 15% |
| 35 | 75% | 25% |
| 45 | 65% | 35% |
| 55 | 55% | 45% |
| 65 | 45% | 55% |
| 75 | 35% | 65% |
This is meaningfully more aggressive than the older “100 minus age” rule, which most modern advisors consider too conservative given current life expectancies and lower bond yields than in past decades.
The framework assumes you are saving for and then drawing down a normal retirement. It is a starting point, not an answer.
When to deviate from the age rule
The age rule treats everyone at age 35 identically. They aren’t. Three factors should push your allocation up or down from the default.
Your true time horizon. A 35-year-old with $50,000 saved and a planned retirement at 65 has a 30-year horizon for that money. A 35-year-old saving for a house purchase in 4 years has a 4-year horizon for that money. Money you’ll need in less than 5 years should mostly not be in stocks, regardless of your age.
Your real risk tolerance. This is the one most people get wrong. Risk tolerance is not what you think you can stomach in a hypothetical bear market — it’s what you actually do when your portfolio drops 35% in nine months. If you have a history of selling during downturns, you have lower risk tolerance than the questionnaire says, and you should hold fewer stocks than the age rule suggests.
Your job stability and income. A tenured professor with stable income and a pension can afford to hold more stocks than a freelance contractor whose income drops 60% in recessions — even if both are 50 years old. Your human capital is part of your overall portfolio.
A useful adjustment: from the “110 minus age” baseline, subtract 10 percentage points if your job is highly cyclical, and add 5 if your job and income are very stable.
The decade-by-decade view
Your 20s (horizon 35–45 years): 85–95% stocks. The math overwhelmingly favors equities at this horizon. The specific stock-bond mix matters less than starting at all and contributing consistently. A 100% stock portfolio is reasonable here — bonds at this stage mostly serve as a behavioral training tool to handle drawdowns.
Your 30s (horizon 30–35 years): 80–90% stocks. Same logic as your 20s. The most important thing in this decade is increasing contributions as income grows, not fine-tuning the allocation by 5%.
Your 40s (horizon 20–25 years): 70–80% stocks. The horizon is shrinking but still long enough that stocks remain the right majority holding. This is also when most people start funding additional goals — college savings, real estate, sometimes a business — each of which has its own time horizon and should be allocated separately.
Your 50s (horizon 10–15 years): 55–70% stocks. The “sequence of returns risk” starts to matter — if a 40% market drop happens shortly before retirement, you don’t have decades to recover. This is the decade to start a measured shift toward bonds and to think about a “bond tent” if you’ll retire at the end of the decade.
Your 60s — early retirement (horizon 25–30 years total): 50–65% stocks. This is the most dangerous decade for getting allocation wrong. You’re transitioning from accumulation to withdrawal, but you may still have 30 years of life ahead. Going too conservative too fast can leave you running out of money in your 80s.
Your 70s and beyond (horizon 15–25 years): 35–55% stocks. Returns matter less than reliability. The portfolio’s job is to last, not to grow aggressively.
The “bond tent” idea
A useful refinement for the years immediately before and after retirement: allocate more conservatively in the 5 years before retirement and the 5 years after, and then gradually re-increase your stock allocation in the decade after retirement.
The logic: a market crash in the years right around retirement is the worst-case scenario for outliving your money. A bond tent reduces that risk. After 5 years of safe withdrawals, the sequence-of-returns risk has largely passed, and you can afford to drift back up to a more growth-oriented allocation that supports a longer retirement.
A common bond tent path: 65/35 at age 60, 50/50 at age 65, 50/50 at age 67, drifting back to 60/40 by age 75.
Rebalancing keeps allocation honest
If you set 80/20 today and never rebalance, after a decade of strong stock performance you might be at 92/8 — a much riskier portfolio than you intended, drifting because of returns rather than choice.
A simple rule: rebalance once a year, and any time any allocation drifts more than 5 percentage points from target. In tax-advantaged accounts, this is a free no-tax operation. In taxable accounts, redirect new contributions toward the underweight asset class to rebalance without selling.
What about international stocks, REITs, gold, and other tilts?
These are second-order decisions. Get the stocks-vs-bonds split right first; everything else is incremental.
A reasonable default within the stock allocation is roughly 60% US / 40% international. REITs, value tilts, and small-cap tilts are rarely meaningfully better than the simple total-market approach over multi-decade horizons; they add complexity for marginal expected return.
Bottom line
Asset allocation is the most important and least exciting investment decision. A reasonable age-adjusted default — start near 85/15 in your 20s and drift toward 50/50 by retirement — captures most of the benefit of any optimized framework. The hard part is staying with the plan when markets swing, not optimizing the plan itself.
FAQ
Should bonds be a percentage of net worth or just my investment portfolio?
A reasonable practical rule is to apply your allocation to your liquid investment portfolio. Real estate, business equity, and pensions all have their own risk and return profiles and don’t slot cleanly into “stocks” or “bonds.”
How does Social Security affect my allocation?
Social Security is functionally similar to a bond — a reliable income stream that doesn’t fluctuate with markets. If you have substantial Social Security or a pension, you can afford to hold a more stock-heavy portfolio than the pure age rule suggests, since your “household allocation” already includes a large bond-equivalent.
What if I have a high-six-figure or seven-figure portfolio?
The same framework applies. Larger portfolios sometimes also include alternative asset classes (private real estate, direct lending, etc.), but these are typically additions to the core stock-bond split, not replacements for it.
Should I shift to bonds if a recession seems likely?
Almost never. By the time a recession seems “likely” enough that you’d act on it, the market has typically already priced it in. Tactical allocation shifts based on macro forecasts have a long history of underperforming strategic allocation that doesn’t change.