When I calculate age in a continuous sub form using the formula that is correct 99.61% of the time, the calculation works well, and there is no problem with with the age field in blank records in the continuous form. However, now that I have changed to the 100% correct formula, the age field blank records show a Type error in the age result field. Why is this? How do I fix this other than reverting to the 99.61% correct formula?