PLYMOUTH — Indiana State Police have issued a Silver Alert for a Plymouth man.

Plymouth Police are investigating the disappearance of William Wallace, an 80-year-old white male, who is 5 feet 10 inches tall, weighs 170 pounds, has gray hair, blue eyes and is believed to be driving a gray 2014 Ford Fusion with Indiana license plate number TF644.

William is in the company of Jane Wallace, an 80-year-old white female, 5 feet 1 inch tall, 100 pounds, with gray hair and brown eyes.

William was last seen about 9 a.m. Sunday, September 29. He is believed to be in extreme danger and may require medical assistance.

Anyone with information on William Wallace is asked to contact the Plymouth Police Department at (574) 936-3187 or 911.