DW and I are mid 40s. We live in a LCOL upper midwest town, have our house paid off, and live off of $60k a year. This amount is plenty for us to live a very comfortable, happy "upper middle class" life.
I make a high income, and with recent run ups on my company's stock price, I'll be making mid-to-upper mid 6 figures over the next several years. So as I drink my coffee this morning, I'm thinking that we can easily spend $200k-300k a year, while keeping our investment totals flat. This feels so counter to how we've lived.
I took a peak at your intro post. I think you will find it is easy for the lifestyle "creep" to take hold, especially with kids... those little suckers can cost some dough! Sports, cars, insurance, college, etc... all can make your spend rate go up. I am in my young 50's with 4 kids, DW has been a Domestic goddess since kid 1 was born (27 yrs ago), but we started very modest living within the $50k range (granted, it was about 29 yrs ago), but with 2 kids in college still, our creep has my current annual budget at $350k (taxable), and that is with only a small mortgage I debate about paying off. Honestly, we are living well, but not rediculously execessive. Once I RE in 2 - 3 yrs when last kid graduates, I am planning for a RE budget of around $250k - $275k/yr (Taxable). It will be easier than you think to raise your spending bar which may give you a little pause before pulling the plug with a lucrative income.