DateDiff(
DatePicker1.SelectedDate,
DPR2.SelectedDate,
TimeUnit.Years
) -
If(
Month(DatePicker1.SelectedDate) > Month(DPR2.SelectedDate) ||
(
Month(DatePicker1.SelectedDate) = Month(DPR2.SelectedDate) &&
Day(DatePicker1.SelectedDate) > Day(DPR2.SelectedDate)
),
1
)