I am using the formula:
=MIN(INT((TODAY()-D-10)/365)+1,4) to calulate from todays date to a past
date and return the number years past with a max of 4 years.

The problem: when I formulate the worksheet I will get "4" in the cell
because it will calculate from today to 1-1-1900, how can I formulate a cell
and get a default value of "0" or blank until I enter a date to which I want
a calculation? I want to formulate the entire sheet and have it only
calculate when I enter a date?