I've read all the replies concerning all the things that could happen in retirement to bust your budget. Honestly, these are all the same things that could happen during your working life. At some point you just have to decide if you're willing to give it a go. Like I've mentioned, our income will be about 44k a year, tax free. That's the same as a 60k a year job. We have no debt besides our rentals and a small house payment.
Our only extravagance will be travelling and our airline miles will get us there, we can rent a place for a month for less than a week in a hotel.
My wifes insurance is through her disability. I can get Obamacare for almost nothing due to our income, or I'll buy a catastrophic plan. I'm on no meds and in very good health. Sure, I could have something major happen tomorrow, but that's not going to keep me from my goal.
Lots of people are raising families on a lot less than we will have. Our kids are all grown and doing well. My parents are financially secure. Our expenses are well in line with our income and we will still be putting something in savings. We have a good sized reserve fund and put away every month for maintenance, capex and vacancies.
We've been planning this for several years and think we are well positioned for our goals.