By 2029, Xavier is one of the last mutants left on the planet. In his old age, he has developed a form of dementia not unlike Alzheimer’s. It was particularly dangerous for Charles as he could no longer control his immense psychic powers. He began to have massive uncontrollable psychic seizures, one of these seizures took place while he was in the X-Mansion.
Xavier had mostly lost his good nature. Having been hidden by Logan for numerous years in isolation, Charles spent his days randomly mumbling unless given his medication. When he had clarity, Charles was bitter, often swore and crazy.