What is the right asset allocation (stocks vs bonds) by age?
A common starting rule: hold your age in bonds (30 years old = 30% bonds, 70% stocks). But modern research suggests more aggressive: 110 minus your age in stocks. A 35-year-old with 30+ years to retirement should hold 75–90% stocks. Reduce to 50–60% stocks by retirement age.
Formula
Rule of thumb: Stocks % = 110 − Your Age. Bonds % = Your Age − 10. Adjust ±10% based on risk tolerance.
Example
Age 35: 75% stocks (45% US, 20% international, 10% small-cap) + 25% bonds. Age 55: 55% stocks + 45% bonds. Age 65: 45% stocks + 55% bonds (preserving capital while maintaining growth).
How it works in detail
Asset allocation is the single biggest determinant of long-term returns and volatility (more important than stock picking). Young investors (25–40) should be heavily in equities because they have decades to recover from crashes, and stocks return 7–10% historically vs. 3–5% for bonds. The 'age in bonds' rule is overly conservative for most — a 30-year-old with 30% bonds sacrifices significant compounding. Vanguard target-date funds use roughly: age 30 → 90/10 stocks/bonds, age 45 → 80/20, age 60 → 65/35, age 70 → 50/50. Within stocks: diversify globally (60–70% US, 30–40% international). Within bonds: use total bond market or Treasury inflation-protected securities (TIPS) near retirement.
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What is Monte Carlo simulation for retirement planning?
Monte Carlo simulation tests your retirement plan against 1,000+ randomized market return sequences to estimate your probability of success (never running out of money). Unlike average-return projections, it captures sequence-of-returns risk — the danger that a market crash in your first few retirement years permanently impairs your portfolio.
Should I use index funds or hire a financial advisor?
Index funds for most people. A low-cost three-fund portfolio (US stocks, international stocks, bonds) charges 0.03–0.10% in fees and has outperformed 90% of professional fund managers over 15+ years. A financial advisor (typically 1% AUM fee) is worth it only for complex situations: large inheritance, business exit, multi-state taxes, or estate planning.
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