We don't have it anymore, so I don't remember specifically what it was. However, it was a double wide...one step up from an umbrella stroller. Our twins were pretty big for 8 years old...I don't remember how much they weighed then, but it was well over 55lbs each...probably 80lbs each or so. They were a bit squeezed at the shoulders, but they still fit fine. The hardest part is pushing when the stroller has small wheels. Perhaps buy a used jogging stroller, which has large wheels. Much easier to push.
The weight limit thing listed on the strollers is legal liability stuff. Reality is they'll hold a lot more than what's listed. Our stroller held easily 175lbs, between the kids and the food bag we strapped to the back of it, and it never had any trouble.