Seconding the advice that doing a case study, even if you don't post it, is really helpful.
I discovered MMM in my mid-fifties. I had vague plans to retire at 60 but had NO IDEA whether this was feasible or not because although DH and I were saving 60-70% of our income, driving old cars, biking, taking transit, cooking at home, taking modest vacations, had a paid off house, we didn't really know what our actual expenses were and therefore what level of income we needed to be happy/secure in retirement. We didn't feel we were particularly frugal and were certainly living comfortably. The media hype that "you can never retire" or "you need 80% of your pre-retirement income" didn't help either.
Well, once we started some expense tracking, understood the 4% rule, and discovered a community whose values felt by and large in line with our own - we were golden, I mean absolutely covered in gilt. There was absolutely no problem retiring at 60 and in fact, we could have retired earlier if we'd wanted to. For a variety of reasons, 60 felt right. We've continued the expense level that we always felt comfortable at and we have a SURPLUS in retirement. Now we get to have fun and give to charity, which is really fun.
Knowledge is power. Do the case study and find out where you really stand. Then you can build from there. Fingers crossed that you will be a pleasantly surprised as we were but even if the surprise is unpleasant, you'll be on the right path.