Option Explicit
Sub Macro3()
Dim intNumOfDays As Integer
Dim intNumOfMths As Integer
Dim wsMySheet As Worksheet
Set wsMySheet = ThisWorkbook.Sheets("Sheet1")
intNumOfDays = Day(wsMySheet.Range("K68")) - Day(wsMySheet.Range("H68"))
intNumOfMths = Evaluate("DATEDIF(" & CStr(wsMySheet.Range("H68").Address) & "," & CStr(wsMySheet.Range("K68").Address) & ",""M"")")
With wsMySheet
If intNumOfMths > 6 Then
.Range("73:75").EntireRow.Hidden = True
ElseIf intNumOfMths = 6 And intNumOfDays >= 0 Then
.Range("73:75").EntireRow.Hidden = True
Else
.Range("73:75").EntireRow.Hidden = False
End If
End With
Set wsMySheet = Nothing
End Sub