The years are broad though, the nice thing with AI explanations is that they can go deep quickly, and quite precisely down the path you need for your prior experience.
Most people, if they haven't studied mathematics in university, would need to learn hundreds of concepts just to get to the leaves of the tree, and many of these concepts are truly difficult to understand, requiring weeks of study and practice.
But, now, with world class knowledge possessing tutor, you can ask for an explanation of missed concepts, even embarrassingly stupid questions you would never ask a person.