California Highway Patrol officers say it happened on Willow and Olive Avenues just after 11:00 pm.
The CHP said the man was using a walker while crossing the street, but he was not in the crosswalk.
He was taken to Community Regional Medical Center, where he later died.
The driver stopped about a block away. Officials say drugs or alcohol were not factors in the crash.
CHP officers are searching for surveillance videos to help with their investigation.