protected function maxYear(array $individuals): int
    {
        $jd = array_reduce($individuals, static function ($carry, Individual $item) {
            return max($carry, $item->getEstimatedDeathDate()->maximumJulianDay());
        }, 0);

        $year = $this->jdToYear($jd);

        // Don't show future dates
        return min($year, (int) date('Y'));
    }