Is Your Teenager Heading For Millionaire Status?

Why a 50-year investment horizon is a practical reality for any investor in their teens today.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Back in 2001, I began an experiment. FTSE All-Share index trackers were just beginning to catch on, and I began regularly investing in one, topping up my monthly investments with occasional lump sums.
 
In 2009, I ceased adding new money, and re-directed the regular monthly savings into my ISA-sheltered portfolio of higher-yielding income shares. For someone in their mid-fifties, it was a strategy more in keeping with my retirement plans.
 
By then, the tracker investment stood at just under £25,000, around a quarter of which had been in the form of lump-sum investments over the previous two years — including a couple of small inheritance bequests. And I left it to grow.

Today, I’m up 65% in terms of the ‘new money’ invested. And at the FTSE’s recent peak of 7,104, in April 2015, I was up 89%.
 
And had I invested the money more evenly across the period — or skewed those hefty lump sums towards the beginning of the period, rather than the end — the returns would have been even greater.

Wealth engine

All of which I mention because a friend and I were chatting yesterday about how best she could invest some money that her 16-year-old son had accumulated in NS&I bonds.
 
Regular readers won’t have any difficulty predicting my reply.
 
Rather than accept the derisory interest rates on offer by banks, building societies and NS&I, in my view it makes more sense to harness the power of the stock market’s long-term wealth-creating engine.
 
In other words, invest the money in a basket of shares in solid, well-managed businesses — businesses with a long-term record of growth combined with throwing off cash in the form of dividends.
 
For decent-sized sums of money, it can make sense to invest directly in the businesses themselves. But for smaller nest eggs, a low-cost index tracker is probably the best way to get a taste of the stock market’s wealth-building properties.

Shares vs. cash vs. bonds vs. property

Of course, that’s guidance that is suitable for most people with a reasonably long-term time horizon.
 
It’s not generally a good idea to invest money in the stock market that you’re going to need next month or even next year.
 
But over the long-term — and especially when you’ve some discretion about when (or if) to liquidate a stock market investment — studies repeatedly show that the stock market outperforms cash savings and bonds.
 
And stock market investments also have a very distinct advantage over property investments: it’s impossible to buy property with the modest amounts of spare cash that most people have.
 
You either buy all of a house, or none of it. Ditto when it comes to selling, of course.
 
Not so with shares.

Time horizon

But there’s another reason for thinking about the stock market in the case of someone still in their teens.
 
At 16, they have an opportunity that isn’t open to many of us: the opportunity to let the power of the stock market do its stuff over the seriously long term — 50 years or so.

As I’m now in my very early sixties, a 50-year horizon is of no interest to me. But for the 16-year-old in question, it’s an opportunity to build a considerable nest egg with minimum effort.
 
How considerable? Let’s do the sums.

Making a start

Assuming a fairly conservative 7% long-term annual return, £5,000 invested in the stock market will have grown to £147,285 after 50 years.
 
Throw in another £25 each month, and that grows to £300,898. Make that £50 a month, not £25, and the outcome is £437,894. And any 16 year old with a Saturday job should be able to find £50 a month, if the will to do so is there.
 
I could go on, but I’m sure you get the idea: with a 50-year time horizon, remarkable things are possible — including millionaire status.
 
My kids have brokerage accounts, and (modest) shareholdings. Do yours? If not, it could be time for them to set out on that remarkable journey.

More on Investing Articles

Sun setting over a traditional British neighbourhood.
Investing Articles

UK investors should consider buying shares in Uber. Here’s why

Uber shares could be a great fit for long-term UK investors that are looking to generate capital growth, says Edward…

Read more »

This way, That way, The other way - pointing in different directions
Growth Shares

£1k invested in Rolls-Royce shares at the beginning of the year is currently worth…

Jon Smith points out how well Rolls-Royce shares have done so far in 2026, but issues caution when looking further…

Read more »

Finger clicking a button marked 'Buy' on a keyboard
Value Shares

It might not feel like it, but this is the time to think about buying stocks

The FTSE 100 isn’t the first place most investors look for quality growth stocks to consider buying. But Stephen Wright…

Read more »

A young woman sitting on a couch looking at a book in a quiet library space.
Investing Articles

How are Lloyds shares looking in March 2026?

Lloyds shares have taken a tumble in the last month. What has happened? And could this be a golden opportunity…

Read more »

piggy bank, searching with binoculars
Investing Articles

Are Barclays shares really 50% cheaper than HSBC right now?

Barclays shares are trading at a price-to-book ratio half that of rivals like HSBC. Ken Hall looks at what the…

Read more »

Middle aged businesswoman using laptop while working from home
Investing Articles

Is Legal & General a top bargain after its 8% share price drop?

Looking for brilliant dividend shares to buy on the cheap? Royston Wild takes a look at Legal & General following…

Read more »

Silhouette of a bull standing on top of a landscape with the sun setting behind it
Investing Articles

Up 19% in a day, is there more to come from the surging Diploma share price?

Diploma’s share price is storming higher. But does the stock offer safety in an uncertain market, or is buying at…

Read more »

Portrait Of Senior Couple Climbing Hill On Hike Through Countryside In Lake District UK Together
Investing Articles

How much do you need in a Stocks and Shares ISA to target £2,000 a month of passive income?

With a bit of maths, our writer illustrates how an investor could shrink their initial ISA investment while supersizing dividend…

Read more »