Modules & VBA :: Getting Age In Years With One Decimal Place (3.5 Years)

I have a table that lists computers I want to know the age of them for replacement purposes. I am using this function to populate a textbox on a form that updates my table. the results I am getting is a negative whole number I would like to get a positive number with one decimal place. so if computer was shipped September 24, 2010 my textbox would say 3.5 not -3

Here is my function

Code:
Private Sub Form_Load()
Dim theDate As Date
Dim age As Integer
theDate = Nz(Me.compDate.value, 0)
If theDate > 0 Then
age = DateDiff("yyyy", Now(), theDate)
Me.compAge = age
End If
End Sub