I don't know the age group here.
I was too young to see the first, I was a one-year-old. Never saw Empire, still too young. However, I do remeber seeing Return of the Jedi, when I was 7. Well, some of it I remember, mostly Jabba's palace! I remember being totally mesmerized by all the strange creatures, especially Jabba. His whole creation is something to behold, looking back at it now. He looked so real, slimy, gross, disgusting, and you wouldn't want to within 10 feet of the thing. From the synthetic to the final product, the creative talent that went into creature design and creation, really something to marvel at ... even to this day!