It was expected of every African young man to vacate his father's house when he becomes of age! You may ask me what age that was, may be 15, 17, or 18 years or even more! The qualification was as long as they portrayed some capability to build or signs to make children... Well, that worked for some cultures but not all, while other cultures were serious with age. The young men you see are contemporary but a product of the strong African culture-infact one of them owns that beautiful pent-house just next to his father's house. He built this at the age of 15. Afrika, Afrika!