I was in that position until about four months ago.
I was an avid reader of ERE, MDJ, etc in university and shortly after graduating (2006-2008), then I got a job paying 60k, stopped paying attention to my finances and crept up to spending 45-50k/year combined with wife.
I woke up in February this year when I mentioned in casual conversation "Yeah, I plan on retiring around 40 or so". I came home, re-evaluated the numbers, and realized I wasn't even close to on track. Posted my budget, had it ripped apart by you helpful folk, and have since dropped our spending level by about $1000/month without feeling deprived in any way.