1269      * @param string $show_years
1273     public function averageLifespan(string $show_years = ''): string  argument
1275         return $this->individual_repository->averageLifespan((bool) $show_years);
1279      * @param string $show_years
1283     public function averageLifespanFemale(string $show_years = ''): string  argument
1285         return $this->individual_repository->averageLifespanFemale((bool) $show_years);
1289      * @param string $show_years
1293     public function averageLifespanMale(string $show_years = ''): string  argument
1295         return $this->individual_repository->averageLifespanMale((bool) $show_years);
1567      * @param string $show_years
1571     public function youngestMarriageFemaleAge(string $show_years = ''): string  argument
1573         return $this->family_repository->youngestMarriageFemaleAge($show_years);
1593      * @param string $show_years
1597     public function oldestMarriageFemaleAge(string $show_years = ''): string  argument
1599         return $this->family_repository->oldestMarriageFemaleAge($show_years);
1619      * @param string $show_years
1623     public function youngestMarriageMaleAge(string $show_years = ''): string  argument
1625         return $this->family_repository->youngestMarriageMaleAge($show_years);
1645      * @param string $show_years
1649     public function oldestMarriageMaleAge(string $show_years = ''): string  argument
1651         return $this->family_repository->oldestMarriageMaleAge($show_years);
1803      * @param string $show_years
1807     public function youngestMotherAge(string $show_years = ''): string  argument
1809         return $this->family_repository->youngestMotherAge($show_years);
1829      * @param string $show_years
1833     public function oldestMotherAge(string $show_years = ''): string  argument
1835         return $this->family_repository->oldestMotherAge($show_years);
1855      * @param string $show_years
1859     public function youngestFatherAge(string $show_years = ''): string  argument
1861         return $this->family_repository->youngestFatherAge($show_years);
1881      * @param string $show_years
1885     public function oldestFatherAge(string $show_years = ''): string  argument
1887         return $this->family_repository->oldestFatherAge($show_years);