I was ten. I just came across this review of the film from Ebert: "Robin Hood: Prince of Thieves is a murky, unfocused, violent, and depressing version of the classic story ... The most depressing thing about the movie is that children will attend it expecting to have a good time."

...that pretty much sums up my experience of it. It really scared me. I'm sure my parents thought it would be swashbuckling fun.