Men and women between those ages need permission from the security services to travel abroad.
The crackdown follows recent attacks on foreigners which has led to protests in Nigeria.
Plus Cameroon "expels" Nigerians, special forces hunt for abductors of Germans in Nigeria, new Somali PM a "political novice" and more updates.
Why is Nigeria's president still in London?
Why a Muslim leader wants to ban polygamy to stop terrorism
Why do so many people face starvation?
Albino attack survivor lives in fear of more attacks
The captain who left black South Africans to drown
Struggling to get cancer care during Kenya's doctors' strike
Have US sanctions on Sudan backfired?
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