Of course it's possible if you live within your means, get a decent job, etc. Other than mortgage, I've only ever been in debt once. That was when I had to buy some study books which I couldn't afford that month, so paid on credit card and only paid off the minimum payment for a couple of months, then paid off the balance out of wages two months later. At all other times, my savings have been more than the amount owed on the credit cards (usually fully paid off monthly).
I saved before buying anything, whether a car, clothes, gadgets, or whatever. I didn't buy a car before I had enough savings, not only for the car, but also for the insurance, road tax, and a contingency for repairs etc, but then again, my first car only cost £600 and lasted a couple of years. By the time it needed scrapping, I'd saved a couple of thousand and could buy a slightly newer car that lasted 4 years. And so on.
I was still using a old "film" camera when everyone around me was buying digital. The world doesn;t stop turning just because you live within your means rather than buying stuff just because everyone else has it. By waiting a few years to save, I bought myself a lovely, modern, top of the range digital camera far superior to what I'd have bought a few years earlier, that's still going strong and still pretty good spec compared to today's standards. My friends/family who just couldn't wait and had to buy the first generation of digital cameras have long since thrown them away!
Same with clothes. I have work clothes which are 20 years old and still in regular use. Obviously, I also have more modern clothes which I rotate with.
So, in 55 years of life, I've been "in debt" for just two months. Not bad for someone who started working on less than a pound an hour, having to pay for my own professional studying (work wouldn't support me), studied in my own time around a full time job, walked to walk at times when I couldn't afford the bus fare, etc.
If you never get beyond your means in the first place, it's a lot easier to stop yourself getting into problems. Always going to be worse if you let yourself fall into debt and have to try to claw your way back out of it.
My philosophy of saving before spending was borne out of my elder brothers' mistakes. He spent like no tomorrow. He'd get a store card and see the credit limit and regard it as a target to spend, with only the intention of paying the minimum amount. I remember he got a "Hepworths" card to buy a jacket - it was about £40 but the credit limit he was given was £200 - literally, next day, he went to Hepworths and spent the other £160 on clothes he didn't really need. He did the same with a "Tandy" card after buying a radio in Tandy - went and bought a ghetto blaster for a couple of hundred. Madness. He ended up paying several hundred pounds per month just in minimum payments on dozens of store and credit cards. I once saw his statements - they were horrendous, barely paying the interest let alone the debt. He never recovered - still in massive debt in his 60s, which nothing but a load of tat and landfill to show for it. Trouble was that he got a good job straight out of school and earned more than me.
Debt is absolutely evil.