Why are African politicians so old?

Can you ever be too old for politics? Judging by the average age of our leaders, probably not. African presidents are, on average, in their early sixties. And yet Africa remains the youngest continent in the world, with more than half of its people under 25. Why is this a problem? And, more importantly, what exactly is holding young people back?Host: Alan Kasujja (@Kasujja on Twitter) Guests: William Gumede, chairman of the Democracy Works Foundation; Zanetor Agyeman-Rawlings, Ghanaian politician; Isata Kabia, a former MP and minister in Sierra Leone. #AfricaDaily