This is such a hot toy for my boys, ages 6 and almost 2, as well as all the neighborhood kids!  I have them ride in the grass so it is a little slower and safer.  They just love it. My youngest can operate it by himself under close supervision.  It was a bit involved to assemble-it took me about 1.5 hours.  It seems well-constructed and sturdy enough for the adults to try it out!