People who have worked in heavy industry would be allowed to retire earlier
Programme to Retrain and upskill people at about age 45-50 makes more sense.
Reality is that almost no one does heavy labour jobs for more than about 20 years of their lives. For one thing, even after 3-5 years they become more senior & move into management which means admin. Even being an HCA with low education background, these people wind up being senior workers/managers after 10 yrs or so with a lot less labour compared to what they did at start. Care home staff: often part-time and work on/off so they progress to management more slowly but don't wear themselves out too.
Moreover, with age, ppl move completely out of those heavy labour industries and into other industries or types of jobs. The plumber owns a business where he supervises a team of plumbers and the owner spends > half his time on admin, quotes, management, instead of the physicality of putting in/pulling out pipes. He retires at 58 & goes into basket-weaving or Part-time care-takering for the local primary school instead. The vision I had of the muscle-bound worn out working class fellow reaching 65 at the steel works still working full-time moving heavy goods around -- it's wrong. It's a work pattern very few people follow. Plus most of the heavy labour is automated now in many environments. Similar on a building site: plasterers (such a shortage of good ones) are among the few that are still doing somewhat physical jobs as late as their late 50s.
Even farmers reduce the heavy labour part of their jobs as they get older, find younger colleagues to pick up those jobs, etc.
I'm not talking about individuals but population wide... so if you personally know a Stallone type still doing heavy physical labour at 60 for 35-50 hours/week then fair enough, some must exist, but there are actually very few people like. This is why losing occupational physical activity doesn't matter as much as you might have thought it should for people who hit retirement age -- they already wound down occupational physical activity 10-20 yrs earlier.
Losing active travel for manual occupations and junior managers when they reach retirement age does impact their physical activity levels potentially, though.