const myNameSchema = yup.object().shape({
first_name: yup.string().when(['surname', 'age'], {
is: (surname, age) => !surname && !age,
then: yup.string().required()
}),
surname: yup.string().when(['first_name', 'age'], {
is: (first_name, age) => !first_name && !age,
then: yup.string().required()
}),
age: yup.number().when(['first_name', 'surname'], {
is: (first_name, surname) => !first_name && !surname,
then: yup.number().required()
})
},

i want access age in age when condition