In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Children can age an adult faster than _ years in prison.
[EX A]: ten

[EX Q]: Stroke is our nation's number _ killer, and a leading cause of disability for older adults.
[EX A]: three

[EX Q]: Males mature sexually as soon as _ years of age.
[EX A]:
two