Riverside police said both teens died last week after suffering major injuries in the collision.
The crash occurred Aug. 25 at about 7:46 p.m. at the intersection of Arlington Avenue and Mitchell Avenue.
Police said the boys were riding an e-scooter and an e-motorcycle when they were struck by an 88-year-old driver near Rosemary Kennedy Elementary School.
According to investigators, the teens were attempting to cross the intersection when they were hit by a Lexus.
The 88-year-old driver of the Lexus stayed at the scene.
The crash remains under investigation. No arrests have been made.