People with XLH have a normal life expectancy, according to what I have observed in my family at least, longevity or premature death of one of them has been related to other factors independent of the rickets. What is important, is the quality of life of a person with XLH, because it can suffer deterioration, significant level of musculoskeletal, in some cases fractures and/or surgeries of joint replacement, which make more difficult the daily work, should pay attention to your physical limitations to avoid accidents, all this can lead to emotional problems too, so a person with this condition should take care of constantly to avoid having an old age complicated.