I have noticed the same. Most older folks have straight teeth and unless they were smoking or drank fluoride rich water, their teeth are also very white. They also have good face deveploment.
Its the environment and diet. They were active and ate hard meat ( cooked well done) and exercised whether through their lifestyle (farmer, herder etc) or through sports (my dad and my uncles played sports especially football everyday). Thats why they have good bodies. Unfortunately most have developed the pot belly
Most somalis have good bodies to gain muscle and contrary to the popular belief, I think somali diet if optimised is very well suited for muscle building. Only thing somalis need to do is cut down on carbs, eat more meat and vegetables.
I have a very wide shoulders, enormous back and not so skinny calves. I know I would look awesome if I went to gym consistently ( my main problem) I would look awesome.