Funny - 4 years ago my wife and I were DINKS renting a good condo for CHEAP.
Now we have 2 kids, and are in a large house that costs almost double what the condo did - still saving ~60% of our take home however, and on track to hit our stretch target in the next couple years.
Have enough now to not worry about work/paychecks, and by 40 will have enough to last us till we die - will still keep working however, as it will get BORING to have nothing to do with kids in school