I am quite capable of using self serve checkouts but most of the time I prefer a manned checkout I like the human contact and I feel that I am keeping checkout operators in a job
When I taught science 15 years ago I was able to show them foam that could be used for packing made from peanut shells kids could even eat it now that is biodegradable
I turn 66 next month and go to the gym 4 mornings a week Aqua aerobics x2, core and strength, Pilates x2, Zumba and Bar Class using 10kg weights. It gets the endorphins pumping and it is social. Win win situation.