Compound Growth: Time Is Your Most Powerful Tool
An investor who starts at 25, invests $300/month, and earns 10% annually will have approximately $1.9M at 65. Starting at 35 with the same contribution yields only $650K — a 10-year delay costs over two-thirds of the final wealth.
Compound growth formula: A = P × (1 + r)^n. Each year's return adds to the principal, and the next year's return is earned on that larger amount. Time is the biggest multiplier in the formula.
Retirement Account Types
In the US: 401(k) allows pre-tax contributions (up to $23,000/year in 2024) with employer matching; IRAs offer additional $7,000/year. Both grow tax-deferred.
Roth accounts (Roth 401k, Roth IRA) use after-tax contributions but grow completely tax-free. For younger investors in lower tax brackets, Roth is often superior.
Asset Allocation by Age
Young investors (20–40): Higher risk tolerance; 70–80% equities, 20–30% bonds/cash. Maximum growth phase.
Middle age (40–55): Gradually reduce risk; increase bond allocation as retirement approaches.
Near retirement (55+): Capital preservation priority; increase income-generating assets (dividend stocks, bonds) and reduce volatile positions.