Interestingly, Maryland comes in at $81,310 per year, which is close to my goal, of $80K, that I've been shooting for in my FireCalc scenarios.
However, like most of these types of articles, the word "comfortable" is a somewhat vague term. What's comfortable to me might be downright luxurious to one person, and roughing it to another.
For awhile, I figured I'd be quite comfortable on $60K per year, but after I moved, I figured lets make it $80K, to be safe. The article cites housing costs as a major concern in Maryland. However, that's going to depend on where you live. Maryland isn't uniformly expensive. And, if you own your home free and clear, or have your mortgage close to being paid off, your housing costs will either be much lower, or will be in a few years.
Now in my case, my mortgage won't be paid off until I'm 79 years old. I want to retire when I'm 51, so the mortgage will be a big factor for most of my retirement. But, since it's fixed-rate, over time, inflation will ease the pain of it. Presuming I stay wisely-invested, that is.
I bought my first home, a condo, in 1994. By the time you threw the condo fee on top of the mortgage, the payment was a bit over $900 per month. Adjusting for inflation, that would be around $1558 per month now. But, if I had stayed in it, and kept the same mortgage, the total payment today would be around $1100-1200. I know property taxes went up some, and the condo fee, which was $119.58/mo when I first moved in, is around $300 these days.
Actually, if I had stayed in it, it would be paid off now. I got suckered into a high 9.625% interest rate when I bought it, at age 24, with a low income and not much credit history. I refinanced in 1999, to around 7.25% I think. And then in 2002 I refinanced to a 15 year mortgage at 5.5%. If I had stayed the course it would have been paid off in 2017, but knowing me, I probably would have refinanced again, once rates dropped even more, so I'd probably still have a small mortgage. I don't know what a 15 year average rate is nowadays. My 30-year, on the new house, is 3.875%, so I imagine you could get a 15 for around 3, or a bit less?