On Misty’s age, since I always see confusion about it.
In the anime she’s 10 years old, the same age as Ash. Her age is only ever stated once: in the Japanese version of the third episode, upon waking up with Caterpie in front of her face she cries out “This is absolutely the worst morning I’ve had in my 10 years of life”. Her line was changed in the dub for whatever reason, so her age is never mentioned at all.
I’ve been told that she was stated to be 12 in some western merchandise, but considering it wasn’t all that uncommon for early western merchandise to have mistakes (for instance, on the back cover of Tracey West’s first novelization of the anime Ash was apparently said to be 11) I wouldn’t consider those canon over the anime.
The second picture in the photoset is a scan from an official anime guidebook, stating that she is 10.
She is 12 in Toshihiro Ono’s manga “Pokémon Dengeki Pikachu”/”The Electric Tale of Pikachu”, but the manga was only based on the anime (not the other way around) and changed the story and the characters quite a bit, so it’s basically an entirely separate canon.