Why does Ash Ketchum stay 10 Years Old?

When is Ash Ketchum leaving Pokémon?

Pokémon confirms the return of Ash and Pikachu… in their own way - Softonic

Pokémon: 10 Times Ash Acted His Age (& Suffered For It)

Ash Ketchum - Wikipedia

How is Ash Ketchum just 10 years old? - Quora

Pokemon Anime: The Ages, Hometowns, And Known Relatives Of Ash And 9 Of His Companions

Why does Ash Ketchum stay 10 Years Old?

Saying goodbye to Pikachu and Ash, plus how Pokémon changed media forever : It's Been a Minute : NPR

Ash Ketchum - MyWaifuList

Ash Ketchum Catches a Career—or Several—on Pokémon TV

Remembering Ash Ketchum, the Immortal 10-Year-Old of Pokémon