am not Master but a fellow learner....
below are my observations
1. But that does not ensure that within a decade life expectancy will improve by 10 years
Life expectacy is 80yrs now, but how have we measured this ? What is the reference year of it? This is right on spot....
2. Giving an counter-example of infant morality also rightly questions the assumption.
3. assumption of all children born are americans
...but we know very well that America is the land of immigrants....so if the children born for immigrants, the children in all practical terms are americans, but would they be having the same general life expectacy or would it come down...continuing this, if there is a wave of immigrants from SouthAmerican continent reaches USA, would we be able to say if the life expectacy is going to be same or more even when Medical Technology progresses
But apart from the third para, i am very much convinced with the essay....
As we know that no Essay is right or Wrong..this is just my personal opinion...
Note: Give me kudos if my approach is right , else help me understand where i am missing.. I want to bell the GMAT Cat
Satyameva Jayate - Truth alone triumphs