You can't teach an old dog new tricks
a pero βjexo no aɪ kjen le enseɲe tɾukos nweβos
In Spanish A perro viejo, no hay quien le enseñe trucos nuevos.
This idiom is widely understood in Spanish-speaking cultures and is used to express the difficulty of changing someone's habits or behaviors, especially in older people.
Example
"Mi abuelo no quiere aprender a usar la computadora; a perro viejo, no hay quien le enseñe trucos nuevos."
