Number Of Years To Show In Userform Textbox

I am trying to show the number of years in the userform textbox based from today's date and into the date the eqpt was installed. I stuck with the below code.

Code:
Private Sub DTPicker1_Exit(ByVal Cancel As MSForms.ReturnBoolean)
If TextBox1.Text "" Then
TextBox2.Text = Year(DTPicker1.Value) - Year(TextBox1.Text)
End If
End Sub

Where in textbox1 I have this code that activates on userform initialize

Code:
If Me.TextBox1.Value = "" Then
Me.TextBox1.Value = Format(Date, "dd.mm.yyyy")
End If
End Sub

Textbox2 is where I want the number of years to appear .