It depends on multiple factors, of course. We're only semi-retired at 70, because DH is still running the business he started 34 years ago, although he's no longer hands on onsite. But he retains oversight of the commercial aspects, and is the memory bank for the company. I still look after the pension funds that we have, but not all the routine admin tasks which are mostly automated now.
Our home costs as much or more to run as ever, mainly because at 70 we don't have the stamina for a steeply sloped garden, so we need a contractor to do the heavy lifting. We shall move and downsize a bit, but we are also helping our DC with their rent in the Southeast for the next year or so. None of the everyday costs have gone down because we are retired: we have to eat and drink and stay warm. There's no longer a mortgage, which helps, but CT is £365 per month.