In this post we have a function for calculate the age of a contact based on the birthdate field. The poster updates the label of the birthdate field with the "age" variable. I want to update the "age" field with the "age" variable. I don't know JavaScript, but gave a go at deciphering what's there thought it might be:
Xrm.Page.getAttribute("age").setValue(age);
Which doesn't work. I gave it a try. ;-)
In this case age is the field name and the variable name.