Schedule invoke function, what are the arguments?

Schedule invoke function, what are the arguments?

I have a simple function defined:
  1. void CheckAge(Children recAge)
    {
        if (recAge.Age  >=  18.0)
        {
            recAge.Status = "Over 18";
        }
    }

Now I want to run this function in a custom schedule.

I don't understand what the "value for the arguments" should be, or in other words what should be between the brackets in the schedule:

  1. thisapp.CheckAge( ?????? );