this formula should work for short time differences.
=Year(Today() - datecol + 1) - 1900 & ' Years, '
& Num(Month(Today() - datecol + 1) - 1) & ' Months, '
& Day(Today() - datecol + 1) & ' Days'
it gives incorrect result for datecol = Today - simple if can solve that
it gives you one extra day for each Leap Day - this seems to be much harder to solve...