For those of you that are appalled at the fact that someone may look funny at your little (big) darling in a stroller I will pose the to you:
The grade school kids in strollers is an American phenomenon. In no other country have I ever seen fourth graders in a stroller. It is also a phenomenon mostly limited to WDW. There aren't any other places where I have seen children that big being wheeled around, and if I do see it is the exception, not the norm.
Consider that many of the visitors to WDW may mot be Dis posters, American, or annual WDW visitors, and, therefore, not used to seeing this.
I will relate our 1st visit to WDW with a, then, 5 year old and 8 year old. We made our 1st visit to MK. My, then, 5 year old points to a big kid in a stroller and says, "mom, that kid's bigger than me and he's in a stroller." Being uninitiated, I nicely explained that he was probably disabled. When he jumped out of said stroller and raced up to Space Mtn. and ran through the cattle shoots to the ride, my much wiser and mature, then, 8 year old said, "that boy is NOT handicapped."
So if you think no one notices, you are mistaken. While I have never seen anyone openly mocking a child to their face, I am sure there is some snickering behind hands.
I am also sure that people will come on here with tales of "hidden disabilty" and whatnot, and I would be inclined to believe that if big kids in strollers were less common in WDW, but from the numbers we see, which is a much higher percentage then anywhere else, I am not inclined to believe that this is true in most cases.
I will say again, I really dont care what you (general " you") do with your own kids. Like I said before, you can push them into their 1st college dorm in a stroller, if you so desire, but if you choose to put them in a situation, or allow them to put themselves in a situation where they look foolish, don't be surprised if people stare.
...and I do believe the OP had reservations about this, too because the title of this thread is, "stroller for an 8 year old?" and she went on to be concerned that it would look like a BABY stroller.