Question

The proportion of older adults who continue to employed in the european union countries increases dramatically with age. stays the same over time. declines precipitously with age. usually work in countries other than their native lands.

Answer 1

I believe the answer is: declines precipitously with age. 
European nations are known for their massive budget allocated in welfare programs such as free public health care.
Programs like this make the citizens much more likely to retire early and started to seek another type of fulfillment after they grow old.