Yes, I think that the difference is that those of us with dyscalculia have had problems with numbers all our lives. For instance, I have never been able to retain the multiplication tables, no matter how many times I've tried to learn them. Another thing that is common with dyscalculics is the need to use our fingers to help us add things up (we learn how to do it discreetly, however, so most people won't notice). These kinds of things don't change with age or situation, they're with us our whole lives.