Final answer:
The claim that only young children are at risk of developing fluorosis is false. People of all ages can be affected by skeletal fluorosis, and while children under 8 are more at risk of dental fluorosis, proper fluoride levels benefit dental health for all.
Step-by-step explanation:
The statement that only the young children are at risk of developing fluorosis is false. While it is true that children under the age of 8 are particularly susceptible to dental fluorosis, because it occurs while the permanent teeth are developing, people of all ages can be affected by skeletal fluorosis if they consume water with excessively high levels of fluoride.
The U.S. Centers for Disease Control (CDC) and the Environmental Protection Agency (EPA) acknowledge that fluoride has benefits for both children and adults but they also suggest that exposure to high levels, particularly in areas with naturally occurring fluoride in groundwater, carries a risk for both dental and skeletal fluorosis.