It's related to government. This happens mostly in countries in which the child grows and goes from parenting to gov-parenting. Govs use this to maintain happy slaves in their portfolios, and the method is as this: they use the grown ups to extract their rent and spare it over the less grown ups. In the end, maturity average is less and less, up to a point in which a big reset must happen, or otherwise mega destruction would inevitably happen. This cycle is best understood with this meme: