Its safe. Botswana is the only country in africa that has never had a civil war. Only worries you have is that you need to keep your fly closed, or it wrapped up as HIV is very prevalent here.
You have about as much chance as anybody else in getting a job here. You just need to show up and prove why you are better than everyone else and why you should get hired over them.
Age doesnt matter, although the normal age does seem to be around 20.
Bush flying is a great way to get your hours up, gaurenteed that you will have at least 1500hrs more than what you came here with before you leave, and with a few hundred hours on turbine with the caravan.
Fantasic place to really learn how to land a plane, making command decisions etc etc.
@Atis. Your first mistake was going to Sefo.