You can be correct and in fact it could be in many other country like that but however I can ask where did you get your statistics from to back up your claims. Such kind of information require source for further knowledge and research.

Well again the reason for that is because wealth in time past was built either from history of the family lineage and their fathers which people say someone is born into royal family or with a silver spoon. Also it was from hard labour and work, also with planning, investment and embezzlement of public money.

We are going to see changes in the age of being wealthy soon with cryptocurrency investment by the youth.