Ohio Rev. Code § 2305.04: Recovery of real estate.

An action to recover the title to or possession of real property shall be brought within twenty-one years after the cause of action accrued, but if a person entitled to bring the action is, at the time the cause of action accrues, within the age of minority or of unsound mind, the person, after the expiration of twenty-one years from the time the cause of action accrues, may bring the action within ten years after the disability is removed.