Yup minimum age validation with day month year values from dropdown

Using select control to pickup day, month, year of dob

How to validate min age say 18 in yup itself

      dateOfBirth: Yup.object().shape({
        day: Yup.string().required('day is required'),
        month: Yup.string().required('month is required'),
        year: Yup.string().required('year is required')
      })