Last week I was chatting with a friend and we were talking about how much things have changed in the past 30 years. I remember as a child getting excited to collect the mail from the mailbox in front of our house, hoping it was my pen pal who had sent me a letter. The mail was delivered every day and there was an abundance of post back then.

Fast forward to today: mail comes once a week, rarely is anything in the mailbox, as almost everything is delivered electronically now, and sadly you can clearly see that the postal service is slowly facing extinction.

I am sure most of us can think of something that has changed dramatically over the years, whether propelled by technology or faded due to shifting demand. But one thing is certain: the way we did things 20 or 30 years ago bears little resemblance to how we handle them today.

For example, years ago, debit cards were still a novelty, and ATMs were just beginning to appear at local branches. That's not even touching on how we managed our money back then, which involved balancing chequebooks by hand, queuing up to transfer funds, or waiting for monthly paper statements just to know where we stood.

Today, we have instant transfers, budgeting apps, and real-time alerts. However, regardless of all this progress in how we access, move, and track our money, the core principles of sound financial management have remained remarkably stable.

No matter how sophisticated our tools become, the timeless truths about building wealth and achieving security continue to hold firm.

That said, here are four financial principles that never go out of style.

The first principle, and perhaps the most fundamental of all, is to live below your means.

This sounds deceptively simple, yet it is the bedrock upon which all other financial success is built. Living below your means is not about deprivation or misery; it is about creating a gap between what you earn and what you spend, and then safeguarding that gap.

For decades, financial advisers have preached this wisdom, and it has outlasted every economic boom and bust, every bull market and recession.

When you consistently spend less than you earn, you build a buffer against life’s inevitable surprises, whether it be a job loss, a medical emergency, or a major house repair.

You also create the fuel for wealth-building, because without that surplus, there is nothing to save, nothing to invest, and nothing to grow.

Technology has given us unprecedented visibility into our spending habits, with apps that categorise every coffee purchase and subscription fee, but the principle remains unchanged: the path to financial freedom begins with a simple equation where your expenses are always smaller than your income.

The second principle that has proven its endurance over time is the importance of having an emergency fund.

If living below your means is the foundation, then an emergency fund is the sturdy roof that protects you from the storms of life. Financial experts have long recommended setting aside three to six months' worth of living expenses in a safe, accessible account, and this advice has never been more relevant than in today's unpredictable world.

An emergency fund transforms a crisis into an inconvenience. It means that when the car breaks down or the roof starts leaking, you do not have to reach for a credit card and plunge into high-interest debt.

It means that if you lose your job, you have the time and space to find a new role without making desperate decisions.

In the past, people might have kept this money in a savings account at their local bank, and today, we have high-yield savings accounts and money market funds that offer slightly better returns.

But the principle itself is timeless: some of your money should be kept not for growth, but for protection, readily available for the moments when life does not go according to plan.

The third enduring principle is to avoid high-interest debt like the plague. Debt itself is not bad; mortgages and student loans, when managed responsibly, can be tools for building a better future.

But high-interest consumer debt, particularly from credit cards, is a wealth-destroying force that has ensnared countless individuals across generations.

The mathematics of compound interest, which works so wonderfully for investors, works viciously against borrowers who carry credit-card balances. Interest charges accumulate on top of interest charges, and before long, a modest purchase can cost two or three times its original price.

Financial professionals from every era have warned against this trap, and their warnings are as urgent today as they were when credit cards first became widespread.

The principle is to use credit sparingly and strategically, paying off your balance in full each month, and to think twice before financing anything that depreciates in value. This is not a prudish or outdated notion; it is simple arithmetic.

Every dollar spent on interest is a dollar that cannot be saved, invested, or spent on something meaningful.

The fourth principle is to invest for the long term and resist the urge to time the market.

Remember the old saying “time in the market beats timing the market”, and let's face it, decades of data have proven this to be true. The stock market has its ups and downs, but over any extended period of 20 or 30 years, it has consistently trended upwards.

The investors who succeed are not those who try to predict next week’s movements or panic-sell when the news turns gloomy; they are the ones who stay the course and contribute regularly.

This principle requires patience and emotional discipline, two qualities that are no easier to practise, especially with the rise of 24-hour news cycles and social media chatter.

But the wise investor tunes out the noise, maintains a diversified portfolio, and remembers that investing is a marathon, not a sprint.

This principle has survived every market crash from the Great Depression to 2008 to the pandemic, and it will continue to guide those who are serious about building lasting wealth.

So, as we navigate a world where banking happens in an instant and artificial intelligence offers to manage our portfolios, it is worth remembering that the fundamentals have not changed: living below your means, maintaining an emergency fund, avoiding high-interest debt, investing for the long haul, and never stopping your financial education.

These principles are not relics; they are the bedrock of financial wellbeing, tested by time and proven by the lives of those who have practised them.

• Carla Seely is the chief operating officer at Freisenbruch Insurance Services Ltd and has 26 years of experience in international financial services, wealth management, and insurance. During her career, she has obtained several investment licences through the Canadian Securities Institute. She holds the ACSI qualification through the Chartered Institute for Securities and Investments (UK), the Qualified Associate Financial Planner (QAFP) designation through FP Canada, and the Associate in Insurance (AINS) designation through The Institutes. She also completed a master's degree in Business and Management through the University of Essex

• For further inquiries or suggested topics, e-mail: justaskcarla@outlook.com