Daniel Schmidt, who drives a brown 2002 Cadillac with the New York license plate AYP1942, was last seen at his home on Locust Avenue about 9 a.m. Wednesday, Nassau police said.
Schmidt is 6-foot-3 and 160 pounds. He has brown eyes, white straight hair, a light complexion, and a white beard and mustache, police said.
Investigators asked that anyone with information about Schmidt call Crime Stoppers at 800-244-TIPS.
The Nassau County Silver Alert program was established in August to disseminate information quickly when an elderly person or others suffering from Alzheimer's disease, dementia or other cognitive disorders is missing.