Update on Wednesday, Jan. 17, 2018: The Polk County Sheriff's Office announced authorities found a missing 81-year-old Lakeland man with Alzheimer's disease safe on Wednesday morning.

John Shiver ran out of gas in the Clermont area, according to the sheriff's office. Clermont police officers found him and checked him with emergency medical services.

Shiver has been reunited with his family.

Original Story on Tuesday, Jan. 16, 2018: A Silver Alert has been issued for an 81-year-old Lakeland man who has Alzheimer's.

John Henry Shiver was last seen at about 12:30 p.m. Tuesday at Lakeland Regional Health.

Along with Alzheimer's, he is insulin dependent.

He is 5-foot-7, 170 pounds with gray hair and blue eyes. He was wearing blue jeans, black velcro sneakers and a navy blue CSX jacket.

He is driving a silver 2009 Toyota Tacoma pickup truck with Florida tag J212MG.

If you have any information, please contact Detective McLeod at (863) 287-4562 or the Polk County Sheriff's Office at (863) 298-6200.

Make it easy to keep up-to-date with more stories like this. Download the 10 News app now.

Have a news tip? Email tips@wtsp.com, visit our Facebook page or Twitter feed.