My living expenses stayed about the same when I stopped working. The biggest savings were in payroll taxes, 401K contributions and work related expenses for clothing, transportation, etc...
The biggest new expense for me was health insurance premiums.
I would suggest that you and your wife begin tracking your expenses, try living on a retirement budget while you are still working and have time to adjust your plan. Be honest with yourselves about the need to continue saving in retirement for things like travel, charitable contributions, new vehicles, home repairs, final expenses, etc...
Good luck!
I agree. My expenses stayed about the same as well, except for the things you noted -- transportation, etc. Of course, the cost of utilities has gone up, because the rates have been raised, and food prices have gone up as well.
Since you are both under 65, you will have to consider the cost of health insurance and deductibles, co-pays, etc., for some ten years. At the present time, the whole insurance situation is in flux, and who knows what premiums will be a couple of years from now.
My house is paid off, but I still have homeowners' insurance and taxes (which continue to rise), and of course unforeseen home repairs can be expensive.
With the economy and the healthcare system looking as it does now, I would be very hesitant to retire at 55. And, if it doesn't work out, it might be very difficult to find another job that would pay what you need. The days of "I can always find another job" are long gone, especially as we get older.
I agree with Aunt Bea about keeping realistic track of your expenses for a while, and trying to live on what you would have in retirement, to get an idea of what that might look like.