{Reference Type}: Editorial {Title}: Eight billion people, sixteen billion hip joints today: are future orthopedists prepared to treat a world of ultra-old patients and centenarians in 2050? {Author}: Hernigou P;Bumbasirevic M;Pecina M;Scarlat MM; {Journal}: Int Orthop {Volume}: 48 {Issue}: 8 {Year}: 2024 Aug 8 {Factor}: 3.479 {DOI}: 10.1007/s00264-024-06245-x