The 80 year olds now lived a healthy long life. There's not much reason to believe the 20 year olds now will be in this situation in 60 years considering no one

The 80 year olds now lived a healthy long life. There's not much reason to believe the 20 year olds now will be in this situation in 60 years considering no one is having kids so there will be no one to take care of them in their old age.