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It’s currently estimated that there are about 3,000,000 millionaires in the United States today. And given that there are about 300,000,000 Americans according to the latest Census data, that means about 1 in 100 are millionaires.

Even more startling is that means that you probably know someone who is a millionaire, and you probably live within a stone’s throw of other millionaires that you don’t know.

The truth is that a lot of millionaires have very specific habits. Traits that make them successful. One of the most interesting aspects of my Better Know a Young Millionaire Investor series is what makes some of these millionaires tick.

Beyond the inspirational, here are five fundamental habits that your millionaire neighbor has but probably isn’t telling you.

1. Start Young and Don’t Mess Up

Many millionaires start young. It’s so much easier to start young rather than older. You just have more time – it’s simple math.

Plus, the younger you start, the longer you have to see your money compound over time. Just think about what Dave Ramsey said last month:

Saving only $100 per month from age 25 to age 65 at 12% growth = $1,176,000. Everyone should retire a millionaire! — Dave Ramsey (@DaveRamsey) February 12, 2013

He got into a lot of hot water for this quote – but think about it. If you start at 25, you have 10 more years than starting at 35. You can debate the rate of return all you want, but younger is always better than older.

However, part two is to not mess up. This means avoiding student loan debt, credit card debt, and not getting into financial trouble. Some of the most common causes of debt and financial trouble include: increased expenses with reduced income, unemployment, gambling, poor money management, no money communication skills, and banking on a windfall.

If you stick to a balanced budget and start early, you’re already on par with your millionaire neighbor. Remember, focus on front loading your financial life.

2. Don’t Move and Don’t Get Divorced

There’s messing up, and then there are avoiding big expenses that could possibly be avoided. Two of the biggest life expenses are moving and divorce.

First, moving may be necessary, and it doesn’t have to be expensive. However, for many people, it is. Just the cost of paying movers can add up into the $1,000s of dollars, so the more you do it, the costlier it is. Second, if you have to sell a home, the transaction costs are enormous. The more you do it, the more profits you eat into.

Now, moving can be a good thing – getting a better, higher paying job. Or maybe you’re moving closer to work to minimize expenses. You can even use inexpensive movers to mitigate costs if you’re moving farther away. Just remember, constant moving is a constant budget buster.

Next, we have to address divorce. Divorce is one of the leading wealth destroyers in America. Now, can it be avoided? Not always. But there are genuine things that you can do to minimize the likelihood of it and the financial costs that come with it.

First is communication. Communication about money is essential, as finances are the leading cause of divorce. And divorce never stems from lack of money – it comes from failure to work together with money. You need to put systems in place that allow you to work as a team with the money you have to better your future. Common goals and common understanding are key.

There are much better resources than this when it comes to money and family, but realize that divorce destroys wealth. That’s why your millionaire neighbor has probably been married for years.

3. Invest Slowly Over Time

Beyond just starting young, you should also invest slowly over time. I’m not saying that you have to dollar cost average when you invest, but you should start investing early, and continue to invest throughout your life.

This is the power of compound interest. The later you start, as mentioned in #1, the more you have to invest to get the same return.

Your millionaire neighbor probably started investing in their 401k at their first job and just continued to contribute to it at every job. He or she also probably maxed out the IRA contribution each year.

These simple investing steps over time allow you to build real wealth. For most Americans, their wealth is in the homes, which they paid off over time, or in their retirement accounts, which they built up slowly over time.

So, if you want to join your millionaire neighbor, start investing now, and continue to do so regularly.

4. Create Multiple Income Streams

Your millionaire neighbor also probably didn’t do it just working their job. Maybe if they are over 65, but even then, there was likely more to it that working the nine to five. Most millionaires had a side hustle or combined income streams. It’s very rare for a single income family to make it to millionaire status. If they are a couple and both worked, that is probable. If they didn’t have kids, it is even more likely.

But the better way to make it to a million is to not only work a salaried job, but also to side hustle or have some type of entrepreneurial project.

By developing multiple income streams, not only do you create a safety net for yourself as you work towards you goals, but you also can reap the benefit of multiple income streams, especially if some are more passive than others.

If want some passive income ideas, here’s a list of 20 different passive income streams.

Your millionaire neighbor may have a secret business besides the nine to five – just look at most bloggers out there!

5. Live Below Your Means

Finally, most millionaires live well below their means – so much so that you may not even believe that they are millionaires. I know a large handful of millionaires that are beyond frugal – driving the same car since the 1980s, shopping at thrift stores, never eating out. I even know young millionaires that look for frugal deals online, and use coupons to pay for everything online and offline. Check out this post on how to save $500 per month by using simple tricks.

But it makes sense – many millionaires didn’t get rich by spending their money. They got rich by saving their money and making smart money decisions. And those are habits they developed over a long period of time, so they don’t change even when there is plenty of money to spend.

So, if you want to match your millionaire neighbor, mimic them and don’t let them even know you have money. Live frugally, make smart money choices, and live below your means. You’ll get the joy of being a millionaire without the hassles of maintaining an exuberant lifestyle.

What other secrets to success do you think your millionaire neighbor has?