Unless your retirement plan is dying you at the very least need nurses to keep you clean, doctors to keep you alive and farmers to keep you fed into your 90s.

Unless your retirement plan is dying you at the very least need nurses to keep you clean, doctors to keep you alive and farmers to keep you fed into your 90s. If 2/3rds of the population are over 60 none of those jobs can be filled with the number of people to keep even the top 10% alive. At that point soylent green becomes reasonable policy.