Those with spinal abnormalities would be better off seeking medical advice and treatment. Most people die of heart disease and cancer between 50 and 65 than at older ages. Once you have reached your 70s, you have overcome a statistical hurdle. Some demographers have suggested that only relatively fit people live beyond 65. Of course, this is merely a statistical game.
Real people die of real diseases at any age.
Still, the observation you mentioned is intriguing.