19) D

The phrase “throughout their lives” is key here.

A – Wrong
This option is more of an assumption rather than a conclusion. It says that “developed countries WILL NOT be achievable” which is assumed.

B – Wrong
This is also an assumption

C – Wrong
This option actually does not make sense as people who exercise when they are young gain benefits

D – Correct
The passage clearly links lifelong exercise with good health, hence the correct option

E – Wrong
Again, this option does not make sense

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