SQlite Issue with Nested Queries

Hey guys I have been working on this but i couldn't solve it, is any one can help me with that please? Im just confused, can some one help me how to fix the code?Sorry for the content because i couldnt upload image

SELECT Employee.EmpName, Employee.Age

FROM Employee

WHERE Employee.Age < (SELECT COUNT(Employee.EmployeeID)

FROM Employee, Department

WHERE Department.ManagerID = Employee.EmployeeID 

GROUP BY Employee.EmployeeID

HAVING COUNT(Employee.EmployeeID) >= 2) 

//(Question) Find the youngest manager who manages more than one department. the query return the name and age of the manager.

SCHEMA

Employee(EmployeeID:Integer, EmpName: String, Age: Integer, Salary: Real)
Department(DeptID: Integer, DeptName:String, Budget: Real, ManagerID: Integer)
Works(EmployeeID:Integer, DeptID: Integer, Percent_Time: Integer)