A 90-year-old woman has been charged over a crash that killed a teenage pedestrian in Sydney’s northwest last year.

Emergency services were called to a crash in Carlingford on December 1, after reports a car had left the road and hit two teenage boys walking on the footpath, NSW Police said on Monday.

A 17-year-old boy died at the scene, while another boy, also 17, was taken to hospital with a head injury.

The driver of the sedan, a 90-year-old woman from Epping, suffered a leg injury and was taken to hospital, where she underwent mandatory testing.

She was charged on Sunday with negligent driving occasioning death and negligent driving and will appear appear in Burwood Local Court on May 15.

— AAP