I was in grad school, she was a consultant. Our income was solidly lower middle class for LA, and we still managed to save 25-40% of our income per year.
Now that I've got a kid and am in my 40s, I've taken a year off, and I don't think I'd be bored in "early retirement". I'd probably spend time with my daughter, do more camping, and work on intellectual side projects (I have more than I can count).
The trick has been: I don't try to keep up with other people, I follow my own passions. I know how to cook, and to make my own fun. I'm curious and I like find out answers on my own. I never took on credit card debt.
I'm lucky because I had support from my parents through early college. I got student loans and supported myself after sophomore year or so. (I'm strategically still paying the minimum on those loans fwiw.) otherwise I stayed out of debt until I got a mortgage in my late 30s.
So, it is possible to do both. But I have noticed that I have a better ability to control my desire for acquisition than most people, and a decent amount of frugality in most areas of my life.