The math of starting early

The $100 that becomes
$379,000.

Compound interest is the closest thing to free money there is — but it only pays out if you give it time. Here's the math on why a little invested today beats a lot invested later.

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The idea in one minute

Your money starts
earning its own money.

Compound interest means your returns start earning returns of their own. In year one, your money grows. In year two, your money and last year's growth both grow. Repeat that for decades and the snowball becomes an avalanche — most of what you end up with is growth you never had to save for.

Same $100 a month

Ten years early is
worth a fortune.

Four people each invest $100 a month until they turn 65, all earning the same 7% a year. The only thing that changes is the age they start.

$379kAge 20$54k in$180kAge 30$42k in$81kAge 40$30k in$32kAge 50$18k in

$100/month at 7% a year until age 65. The amount under each bar is what you actually put in.

Everyone earns the same 7%. Starting at 20 instead of 30 costs just $12,000 more in contributions — and returns almost $200,000 more.

The cost of waiting

The real price of
"later."

$12,000
extra invested, age 20 vs 30
+$199k
extra you'd have at 65
86%
of the age-20 total is pure growth
Every $1 invested at age 20≈ $21 at 65
Every $1 invested at age 35≈ $8 at 65
Every $1 invested at age 50≈ $3 at 65

The early saver doesn't put in dramatically more money. They simply give every dollar more time to compound.

But what about crashes?

Even the worst timing
still won.

The two scariest markets of our lifetime were the 2008 housing crash and the 2020 COVID crash. Picture the unluckiest investor alive — someone who put in a lump sum at the exact top, right before each one fell.

20072009−57%2020−34%Today

Illustrative S&P 500 path with dividends reinvested. Not drawn to exact scale.

$10,000 at the 2007 peak — worst possible timing≈ $43,000
$10,000 at the 2009 bottom — perfect timing≈ $95,000
$10,000 at the 2020 COVID peak≈ $19,000

The 2008 crash fully recovered in about five years; the 2020 crash in about five months. Nobody can reliably call the top or the bottom — which is why time in the market beats timing the market.

Where the money comes from

The last decade does
the heavy lifting.

Here's that same $100 a month from age 20, plotted year by year. The line barely moves at first — then it goes vertical. The final ten years alone add more than the first twenty-five combined.

$379,259final decade: +$199kAge 20Age 35Age 50Age 65

$100/month at 7% a year. Growth accelerates because each year compounds on a larger base.

The bottom line

Start.
Today.

You don't need to be rich, an expert, or lucky with timing. You need small, steady contributions and the one thing you can never buy back: time. Every month you wait is compounding you don't get back.

Start with Lilikoi How to start investing

Figures are illustrative and assume a 7% average annual return; real returns vary and are not guaranteed. Past performance does not guarantee future results. This is educational, not financial advice.