The max. weight for the slides at WWW have been added to the parks website 

Starting to become normal in all major water parks. Hence why scales have been installed over time.

Like coasters, they are probably going to have to start building slides for a bigger generation soon if its a problem. Im not talking about fatter, i mean physically larger. 

Im just over 6ft tall, when I was a kid I was on the tall end of my classes. These days, 14 year old kids walk past and eye ball me. By the time they reach full growth, 195cm and 100kg isn't abnormal. The models used are well outdated.