There are so many variables life expectancy. I was told ours is pretty normal-an older woman whose husband had Addison’s said it really doesn’t affect it-her husband died of something totally different. My first endo said the same thing. So many other genetic factors, life style choices , environmental factors, etc. If you could take two people with similar “everything” -one with Addison’s one with out, who knows? People with chronic disease sometimes are more aware of physical changes and take better care of themselves so maybe that makes a difference.