Whether or not something is hard or easy is a matter of perspective and the main factor if not the only factor would be on whose doing it. For instance, what's harder calculus or basic addition? When looked at by themselves with no other factors its obvious that calculus is much harder than basic addition but when you take into perspective who would be learning calculus vs who would be learning addition the answer is not so simple.

I was first learning to add when I was in nursery school so you could say that somebody learning addition would be in nursery school or kindergarten. Now, as for who would be learning calculus, a student at MIT (Massachusetts Institute of Technology) would be somebody who would be learning calculus. So now the question is what is harder, for somebody in nursery school to learn how to add or somebody at MIT who is much more experienced with academics and in particular much more experienced with math to learn calculus? Taking that into consideration an accurate answer becomes much more complicated.