When is it legal for persons over the age of 16 to use inflatable personal flotation device?

In the United States, regulations regarding the use of inflatable personal flotation devices (PFDs) vary by state and the type of watercraft. Generally, individuals over the age of 16 can legally use inflatable PFDs in most situations, provided the device is Coast Guard-approved and appropriate for the activity. However, some states may have specific requirements or restrictions, particularly for certain types of vessels or water conditions. It's important to check local laws and regulations to ensure compliance.