Thinking of the people I know who are long term economically inactive long term (I believe that counted as over 6 months) and nearly all I know who fall into that bracket are my parents and there friends. Dad was a factory sparky and mum was a cleaner. Dad stopped work at i think around 61, mum does part time caring now in her early 60s but really struggles and I can see her having to give it up soon.
Most of their friends had similar manual jobs and now in their mid 60s a lot are signed off sick waiting for pension. These are people who have had manual jobs since they were 15/16 and their bodies are knackered. They can't (and very little point) in retraining now for their last couple of years before they get the state pension.
I work in an office job so can feasibly see how I could work to my late 60s and beyond, but those who've done manual work for over 40 years have the wear and tear on their bodies that they simply can't. As well as other health problems & decreasing energy levels that come with ageing.
There's got to be a sizeable number of folk age 60-67 that fall in that bracket? And taking it further is it another stick to beat the working class with?