It maybe just the area I live in but I see the self serve checks almost idle whilst there are queues at the manned checkouts, so it's hard for me to see that many prefer the self serve check out. Unless they are just talking Melbourne and Sydney.
I worked till I was 72 and could have gone on working longer if I wanted to. However, it really depends on the type of work you are doing, it's hard to work in some jobs after you have turn 60.