In addition to the answers already given, it could be bone spurs on the vertebrae. They press against other bones and prevent the spine from straightening. I think it’s caused by arthritis.
My mom stopped being able to stand up straight in her 60s. They had to go in and chisel off all the bone spurs. She had to do some PT because her muscles were weakend from being bent over, but she could stand up after that.
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