How do we not spend money? We just... don't.
We don't live like paupers in any way. We buy what we want to buy. But we've trained ourselves to really consider if any given thing is worth the cost. Usually it's not. Or maybe a thing is worth buying, but not the best / fanciest / trendiest / most expensive version of it.
Pay for quality and durability, not flash and brand name. Particularly for clothes and tools.
We don't get new phones every year. We use a 10-year-old computer that still does what it needs to do (that will probably get replaced next year). Our TV is 15? 18? years old and still works fine if you ignore the red line down the left side of the screen. We don't have the latest greatest audio or video game systems.
We get books and movies and puzzles out of the library instead of buying them. We don't have a dozen different streaming services.
We don't go on big, faraway vacations every year - maybe once every 5-7 years. We stick to long weekends within driving distance a couple of times a year.
We go out to dinner 2-3 times a week, but we almost always pack lunch.
We don't drink much alcohol and don't smoke at all.
We both drive nice cars - our dailies are both Volvos, bought new and well equipped - but we'll keep them at least 10 years and probably 15. We have 4 cars for 2 drivers, but the Concert Coach and the Manic Miata were bought used and inexpensively since they serve backup roles.
Sure, the Miata could use a new top, a big splitter and spoiler, fender flares, 15x10s with Hoosiers, etc. I have a wish list about $3500 deep for it, all in. I could afford it. But would spending that money make it $3500 more fun? Probably not. So I don't.
But DW is going to retire at the end of this year, at age 59. I'll probably retire at the end of next year at 58. We raised 2 kids and put them through college, so it's not like we skipped that expense.