What Age Should You Start Investing in the Stock Market?
The question everyone asks but no one asks early enough. Whether you're 22 or 52, the numbers below will change the way you see time. And if you're still hesitating, this page should push you to act today.
The best age to start investing is now, whatever your current age. But the data shows that waiting 10 years can cut your final capital in half. Here's why.
The simulation that says it all: €200/month until age 65
Assumptions: monthly contribution of €200, average annual return of 7% (historical long-term average of the MSCI World, net of inflation). Goal: retirement at 65.
| Starting age | Duration | Total invested | Capital at 65 | Gains (compound interest) |
|---|---|---|---|---|
| Age 20 | 45 years | €108,000 | €726,000 | +€618,000 |
| Age 25 | 40 years | €96,000 | €525,000 | +€429,000 |
| Age 30 | 35 years | €84,000 | €375,000 | +€291,000 |
| Age 35 | 30 years | €72,000 | €243,000 | +€171,000 |
| Age 40 | 25 years | €60,000 | €160,000 | +€100,000 |
| Age 45 | 20 years | €48,000 | €104,000 | +€56,000 |
| Age 50 | 15 years | €36,000 | €63,000 | +€27,000 |
Read this key line: starting at 25 instead of 35, with exactly the same €200/month, means an extra €282,000 of capital at age 65. The price of 10 years of hesitation: two hundred and eighty-two thousand euros.
Why time matters as much as the amount
The secret of compound interest is counter-intuitive. In the first 10 years, you accumulate slowly. It's frustrating. But in the last 10 years (closest to retirement), your existing capital generates more than your monthly contributions.
Example with a start at age 25:
- Between ages 25 and 35: you invest €24,000 and your capital goes from €0 to ~€34,000
- Between ages 55 and 65: you invest €24,000 and your capital goes from ~€330,000 to €525,000 (+€195,000)
The same amount invested at the end of the period generates 8 times more than at the start. That's why starting early is so powerful: you build up "working capital" for the final years.
What if you're already 40 or 50?
The good news: it's never too late. Even at 50, an additional €63,000 of capital at retirement is better than zero. Many people have savings parked in low-yield accounts that could be working much harder.
At 45-50 however, two adjustments make sense:
1. Increase the monthly contribution
If you start at 45 and want to catch up on lost time, a contribution of €500-800/month instead of €200 radically changes the equation. See our invest €500/month guide.
2. Leverage existing savings
If you have existing savings, the question isn't starting from zero. An initial capital of €30,000 plus €200/month over 20 years yields around €190,000 at 7%/year instead of €104,000.
The specific mistake young people make: not opening a PEA account now
The PEA (Plan d'Epargne en Actions) is France's most powerful tax wrapper for equities. After 5 years of holding, gains are only taxed at 18.6% (social contributions only, versus 31.4% flat tax on a regular brokerage account).
What many people don't know: the 5-year clock starts from the date the PEA is opened, not from your first significant deposit. Opening a PEA at 22 with €100 and doing nothing for 2 years, then starting to invest seriously at 24, means you're in advantageous tax territory by age 27.
If you're still hesitating about investing, at least open your PEA today. Even with €100. The 5-year clock starts immediately. In 5 years, you'll be able to withdraw gains at 18.6% instead of 31.4%.
What to do by age group
Ages 18-25: the time jackpot
You have the greatest possible advantage: time. Even €50/month in a PEA on an MSCI World ETF is enough to trigger the mechanism. Check our complete beginner's guide if you're starting from scratch.
Ages 25-35: the foundational decade
Ideally €200-500/month depending on your income. A PEA should be opened as soon as possible. If you've just started earning a decent salary, automatic monthly contributions are your best friend.
Ages 35-45: acceleration phase
If you haven't started yet, now is the time. But "now" is still enough to build a real retirement supplement. Aim for €500/month minimum and harness compound interest over a 20-30 year horizon.
Ages 45-55: diversification and gradual caution
From age 50, start introducing bond ETFs into your allocation (bond ETF guide). A 70% equity / 30% bond allocation reduces volatility without sacrificing too much return.
Age 55 and above: preservation focus
Priority shifts to capital preservation. If you have a well-funded PEA, life insurance (assurance-vie) takes over for estate planning optimization. See our 4% rule guide for withdrawals.
The thing no one tells you: emotional age matters too
Data shows that investors who start early develop higher risk tolerance and panic less during market corrections. A 30-year-old investor who lived through a crash at 25 knows what to do: nothing, or buy more. A newcomer at 55 experiencing their first -30% may sell everything at the worst moment.
Starting young means acquiring the emotional experience of volatility. That's priceless.
The first XP you earn is the same regardless of your age
Start today on TREESTEP. Every contribution, whether you're 22 or 52, earns you XP, consistency badges and guild progression. The gamification that makes investing addictive, and keeps you on track all the way to retirement.
Start now →Frequently asked questions
Is it too late to start investing at 40?
No. At 40 with a 25-year horizon, €200/month at 7%/year still yields around €160,000 in capital. It's not €525,000, but it's concrete retirement income. And if you can target €400-500/month, the equation changes significantly.
Can I invest in the stock market if I still have a mortgage?
It depends on your mortgage rate. If your mortgage is below 3%, investing in parallel makes sense since the expected equity return (7%/year) exceeds your borrowing cost. If your mortgage is at 4-5%, pay it down first. For variable-rate mortgages, be cautious.
At what age can you open a PEA in France?
From age 18. Under 18 (and up to 25 within their parents' tax household), there is the PEA Jeune with a ceiling of €20,000. See our PEA Jeune guide.
How far before retirement should you start securing your portfolio?
Generally, start gradually reducing your equity allocation 10 years before your target retirement date. Move from 90% equities / 10% bonds to 60% / 40% over 5 years, then to 40% / 60% in the final 5 years. This protects against a market crash right before you retire.