Does anyone have pseudoxanthoma elasticum? Is it an older person's disorder?

Its genetic. Pxe is a genetic condition, meaning it is something you are born with. However, some manifestations develop as people age. Common findings include skin rash/skin changes, leg claudication (pain with walking long distances), chest pain from angina, and bleeding in the eyes. These conditions may occur in people without pxe, but occur at an earlier age in this condition.