Thomas G. Turnbull, 84, of unincorporated Grayslake.

Police are asking for the public’s help in locating an 84-year-old Grayslake man, who authorities say is endangered, after he went missing from Park City Wednesday morning after leaving an appointment.

The Lake County Sheriff’s Office said that Thomas G. Turnbull, 84, of the 34100 block of Wright Avenue in unincorporated Grayslake, was last seen Wednesday at around 11 a.m. leaving an appointment in the 400 block of Greenleaf Street in Park City.

Turnbull was last seen driving his 2015 silver Toyota Corolla with an Illinois license plate of Y878881. The man is showing early signs of dementia and has other medical concerns, Lake County Sheriff Sgt. Christopher Covelli said Wednesday evening.

He does not have a cellphone with him and his family and friends have not seen or heard from him since he left his appointment in Park City. Turnbull is described as being 5-foot-9, 150 pounds, with gray hair and blue eyes.

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It is not known what he was last wearing. The Lake County Sheriff’s Office is asking the public to call 911 if you see Turnbull or his vehicle.