I think it probably depends on whether those who are economically inactive are that way because:
they have worked hard or otherwise squirrelled away the funds to support themselves in the lifestyle they want to live
They are a SAHP who has looked after DCs and/or older parents - potentially now being in a Position to go back into workforce
They have been made redundant and are no longer able to find decent work due to changing skill and qualification levels
They have depended on state benefits for years and do not intend to seek work to support themselves
and lots of other reasons in between those big generalisations.
I presume the Government is trying to reduce the burden on the benefits system. Especially with bigger demands expected in the future with the ageing population trends.
If people are no longer out earning a formal wage, but are in a position to support themselves. Without relying on the Government - whether from savings or inheritances, and if they live a lifestyle that needs less money - but they may also be doing things like running a small holding or have what might be considered "side hustles" earning small amounts of money from hobbies or their professional skills doing small amounts of consulting etc.... if they are able to support themselves and not depend on the Government, then what is the problem?
Or are they trying to get all those 50-60 year olds to take on jobs that no one else will do (or not enough people) like picking crops on farms, nursing home care staff, retail jobs, ...rather than trying to get them into meaningful work based on what they may have done in an earlier career or encourage younger people to go into those roles or make sure that those roles are properly paid and respected.
I know this is entirely filled with generalisations and there are lots of different things going on, but....