According to police, Janet Stohr was last seen in the 4300 block of Argentina Circle, which is located off of Watters Road north of Fairmont Parkway.
Stohr was wearing black pants, a light green sweatshirt and a tan jacket at the time of her disappearance.
She has grey hair, is about 5 feet 4 inches in height and weighs 120 pounds.
Police added it is possible Stohr is confused due to her condition.
Anyone with information on Stohr's whereabouts is urged to call Pasadena PD dispatch at 713-477-1221.