Average is meaningless in this context. US Men hit a 2% chance of death at 68, which jumps to 3.6% at 75. At 85 that jumps to 9.6%, and by 95 your at 26% and the numbers keep increasing. A 50:50 mix of 85 year old men and 38 year old men have vastly higher risk of death than a group of just 62 year olds.
Except those higher odds of death are strongly associated with major heath issues. So, simply excluding the sickest 5% of the population makes a huge difference in survival rates.
Except those higher odds of death are strongly associated with major heath issues. So, simply excluding the sickest 5% of the population makes a huge difference in survival rates.