Do you know the Pokemon anime? Well you probably know about the fact Ash Ketchum is 10 years old. But what if I told you ash actually grows up, he actually has Dwarfism. If you don't know what Dwarfism is, its unusually short size. So Ash might have physical age of 10 but mental age of 12+ currently. In the first few seasons, Ash is 10. in X and Y, he is 11. in Sun and Moon, he is 12. In Sword and Shield, He will be 13.