We are those "young people" you are probably referring to. Mid-30s. 3 newer vehicles, nice 5th wheel toyhauler, RZR (own that free and clear), and we also go to about 25 NHL games a year and a handful of music concerts/festivals and other pro sporting events.
How do we do it? Well yes, we have some debt. But my husband is in IT consulting, I work in software. We have a really good combined income. We also have no kids and no plans to have any, just dogs. We have no consumer debt other than the vehicles and camper, and I have a student loan, my husband's is paid off. We save for retirement and our home is worth $300k more than we paid for it a little over 4 years ago. We bought it only using his income because we weren't married yet. We also own land in WY that we are planning on building a small house on in the next few years and my husband owns land in AZ with his dad, so if things went to hell, we could sell our house and have somewhere to go that's free and clear.
But, our reality is, my husband has an auto-immune disease. He very well may not live to a very old age, so we decide to do some living now instead of saving saving saving so we can maybe do it in retirement in 30 years.
Things we don't do that a lot of people in our age range do: Go to Starbucks every day. Eat out for multiple meals. I cook 6-7 nights a week and eat leftovers for lunches. We don't buy expensive clothing. We don't take many expensive vacations that don't involve our camper. Most travel we do outside of camping is to go to weddings and even then we use airline miles and stay in AirBnBs to save money.
And sure, we would have even more disposable income if we didn't have all the payments on the vehicles and camper, but what would we spend it on? I guess we could put more in retirement, but again, we are trying to enjoy life now, responsibly, instead of not living for the next 30 years.