These methods absolutely can alter genes in adult cells, if they can get in to them. The difficulty would be in designing the vector. How do you get the edit co

These methods absolutely can alter genes in adult cells, if they can get in to them. The difficulty would be in designing the vector. How do you get the edit commands in to the right cells and only the right cells? When we do this in animals we use purpose built viruses to deliver the payload. But it involves a lot of trial and error and it doesn't always take. That's fine for animals, less so for humans.