In order to start receiving a state pension in France you have to have worked for 41.5 years. People who are entitled to retire at 60 will be people who started full time work before the age of 19. This means that they didn’t go far in their education and worked in low paid jobs. Most people in low paid jobs work well into their 60s in order to obtain a decent pension. Nearly every one works extra years to bump up their pensions. People who work on the black market never get a pension and work until they die or become too infirm.
The marine biologists I used to give lessons to calculated they could start thinking about retiring after they were 70.