Margaret Woodman was reported missing at about 4:30 p.m. Thursday in the 1000 block of Idyllwild Avenue, according to the San Mateo County sheriff's office.
Woodman had left her home at about 11:30 a.m. to go for a walk and did not immediately return home, sheriff's officials said.
She was found safe on Thursday night by the Stanford University Department of Public Safety, according to sheriff's officials.