how to calculate the lead time ageing

[#1]

for example

my PO date is 20.05.2016 and today my age is 4 and tomorrow age is 5 and 6 and so.

how to calculate that and what the formula

[swuehl]

LOAD

     [PO Date],

    Today() - [PO Date] As Aging,

     ...

[awhitfield]

Or the same thing in the front end

Expression = Today()-PODate

Andy