It's the internet, where comments remain in perpetual purgatory. Considering that you lack the ability to understand how definitions work, is no surprise you are found lacking here, as well.
I can see that you believe the world revolves around your perspective (it doesn't). How you personally define age groups, with your rigid categorization, is not how the larger world views this, nor how the accepted definitions are determined.
(TLDR: Your world view is only your own, and you don't matter in the larger scheme of things. Get over yourself.)