795      * @param bool   $show_years
799 …private function parentsQuery(string $type, string $age_dir, string $sex, bool $show_years): string  argument
863                 if ($show_years) {
898      * @param string $show_years
902     public function youngestMotherAge(string $show_years = ''): string  argument
904         return $this->parentsQuery('age', 'ASC', 'F', (bool) $show_years);
930      * @param string $show_years
934     public function oldestMotherAge(string $show_years = ''): string  argument
936         return $this->parentsQuery('age', 'DESC', 'F', (bool) $show_years);
962      * @param string $show_years
966     public function youngestFatherAge(string $show_years = ''): string  argument
968         return $this->parentsQuery('age', 'ASC', 'M', (bool) $show_years);
994      * @param string $show_years
998     public function oldestFatherAge(string $show_years = ''): string  argument
1000         return $this->parentsQuery('age', 'DESC', 'M', (bool) $show_years);
1443      * @param bool   $show_years
1447 …private function marriageQuery(string $type, string $age_dir, string $sex, bool $show_years): stri…  argument
1511                 if ($show_years) {
1546      * @param string $show_years
1550     public function youngestMarriageFemaleAge(string $show_years = ''): string  argument
1552         return $this->marriageQuery('age', 'ASC', 'F', (bool) $show_years);
1578      * @param string $show_years
1582     public function oldestMarriageFemaleAge(string $show_years = ''): string  argument
1584         return $this->marriageQuery('age', 'DESC', 'F', (bool) $show_years);
1610      * @param string $show_years
1614     public function youngestMarriageMaleAge(string $show_years = ''): string  argument
1616         return $this->marriageQuery('age', 'ASC', 'M', (bool) $show_years);
1642      * @param string $show_years
1646     public function oldestMarriageMaleAge(string $show_years = ''): string  argument
1648         return $this->marriageQuery('age', 'DESC', 'M', (bool) $show_years);