Soc. Sec. has a list of qualifying conditions. If your children have one of those, then possibly it can go quicker, but not always. If their conditions are not listed, then they will try to find an equivalent condition to match it to. Our dd has at least one qualifying condition because I’ve seen the list and, like your kids, won’t outgrow it or be “cured”. If I can find the list, I’ll try to send it to you by email.