Also, people are joining workforce many years later than they did even 200 years before. So, effectively, people used to work from when they were 10-15 till they died, and now they work 22-65, if that. Effectively we already have an almost 50/50 split between working and non-working years.
The youth of a lot of people is also a grind of schooling to prepare for a career working. Youth are better off than in the past, but if you're stressing full time studying, that's basically the same thing as working.
