Authors Billy and Akaisha Kaderli retired at the age of 38 and have since traveled and lived all around the world. The Kaderlis are published authors on the subjects of personal finance and world travel.

At the age of 62, we're beginning our 25th year of financial independence. That's quite a feat!

From the beaches on Nevis, West Indies, to the shores of Phuket, Thailand, we have traveled extensively through the past two-and-a-half decades, and what a ride it's been! Young and strong in those early years, we were willing and able to tackle just about anything. Now we tend to be a bit more cautious, but we're not letting up. We still climb into the backs of pickup trucks and soak in volcanic hot pools. No one can take away the wonderful memories we've made, and we are filled with gratitude for all the miles and smiles.

What about you? How do you want to live the next five, ten, 20 years or more? Only you can decide what is best and how to get to your goal.

We were often told that retiring early couldn't be done and that we would fail. These self-supported 24 years have proven the naysayers wrong, and we believe that since we have done it, you can, too. In our books and on our website we share the tools we have used to get us here so that you, too, can create your own successful retirement, early or not.

No matter where you are on your retirement path, here are some time-tested tools we have used. Take advantage of what we know.

Track spending This is basic and oh-so-essential. When you track what you are spending, you know exactly where your money is going, and you're able to make decisions clearly and in real time about your cash outlay.

Throughout the day, take note of everything you spend, either on paper or with a smartphone app such as HomeBudget or Mint. Tracking your spending will be a big stress reliever, and your data entry takes only a couple of minutes a day.

How much do you want to spend per year? If your goal is to spend $30,000 annually, this gives you an $82 a day average to maintain. If you can afford to live on $60,000 a year, you have $164 a day to spend.

The rest is here:

Our 25th Year of Retirement by Age 62