Why did many Arab and East Africa merchants stay in Indian port cities?

The merchants of one port city were in competition with the merchants of another. Each merchant tried to attract a larger group of buyers and traders. The many ports were also growing independent. The rulers of each city-state grew rich from trade and from the taxes placed on goods being traded.

depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.