static void ai_spec_daysOld() {
  for (S pat : ai_texts_unquote(".", "Look for answer pattern", "$X")) {
    SS match = matchDollarVarsIC("$X is $Y days old", pat);
    continue unless match != null;
    for (S dayBorn : filterMatchDollarX_IC("born on day $X", ai_texts(match.get("$X"), "was", "$Y")))
      print("Day born: " + dayBorn);
  }
}