What age should Spirit,Scout and Nix be?

Spirit is more mature then Scout and Nix but she can act childish sometimes so she would be somewhere in her teens cuz she isn’t that old

Scout would probably be the youngest since he is really childish and gets really exited he can be mature when things are serious soo he would be 11 or 12

Nix is mostly like Spirit soo he would be in his teens too but probably younger then Spirit but older then Scout