Hmm,... *mine [my Mum's father] started work as a brass finisher in 1895 - at the age of 13 - with Shanks's of Barrhead, with whom he remained until he was 73 - finally retiring in 1955 after sixty years' service.
However, unlike you, Michael ...... I've no idea what his starting wage was - nor what he earned at the time of his retiral,
... but I'll bet the difference between the two - over the entire six decades of his working life - was nothing like the contrast over a corresponding length of time from the mid~1950s up till the present day.