Calculate number of years

I have a form with a field that the user enters a year into.  If they enter for example, 1902, in the field, I want the difference between this year (2015) and the year entered to be calculated in a 2nd field.

For some reason right now if I enter 1902 in the 1st field I get 110  ?????
SteveL13Asked:
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PatHartmanCommented:
What were the two dates you used?  Post your expression also.
SteveL13Author Commented:
Expression in the number of years field on the form:

=DateDiff("yyyy",[txtYearOfEntryToUS],Date())

I entered 1902 in field txtYearOfEntryToUS and would expect field 2 to return 113.  Instead I get 110.
PatHartmanCommented:
DateDiff() requires two date fields.  You are using an integer and a date.  Why not just do a simple subtraction?

= Year(Date()) - Nz(txtYearOfEntry)

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SteveL13Author Commented:
Because that would have been way too simple.  Thanks!
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