Paula Baker was last seen around 11:30 a.m. Tuesday at Emory Hillandale Hospital, the DeKalb County Police Department said.
Baker is described by police as being 5-feet-6-inches tall, weighing 110 pounds, with gray hair, and brown eyes. She was wearing a brown and plaid jacket with orange pants.
Police said a witness told investigators they believe they saw her at a Walgreens on Covington Highway about an hour after her disappearance.
Anyone who sees her is asked to call 911 or 770-724-7710.