The Power of Starting Early: How Compound Growth Works

The most underrated advantage in investing

Most people assume the key to building wealth is earning a high return. Returns matter, but the most powerful variable in long-term wealth is almost always time.

Compound growth — earning returns on your returns — is simple in principle and extraordinary in practice. The longer your money stays invested, the more aggressively it compounds.

A simple illustration

Consider two people. Person A invests R1,000 a month from age 25 to 35 — ten years, R120,000 contributed in total. Person B invests R1,000 a month from age 35 to 65 — thirty years, R360,000 contributed.

At a consistent 10% annual return, both end up with roughly the same amount at 65 — but Person A contributed only a third of what Person B put in. Starting ten years earlier means investing a fraction of the money for the same outcome.

Why this happens

In the early years, growth feels slow and the numbers look unimpressive. But as the base grows, the annual growth becomes increasingly significant. By year thirty, most of a portfolio's value isn't your own contributions — it's the returns earned on previous returns.

That's why a 25-year-old starting a retirement annuity with R500 a month will very often outperform a 40-year-old starting with R2,000 a month.

The cost of waiting

Every year you delay isn't just one less year of contributions — it's one less year of compounding on everything that follows. The first rand you invest is the one that works hardest for you. Waiting five years to start can cost more than doubling your monthly contributions later.

What to do today

• Start — even a small amount. Consistency matters more than size.
• Automate it, so it's not a monthly decision.
• Increase gradually — even 1% more a year adds up meaningfully over time.
• Stay invested — volatility is normal. Time in the market beats timing the market.

The best time to start was ten years ago. The second-best time is today.