Hi, Erin. You will notice that when you are in the Edit mode or first entering data for a new profile you have several options for the date fields: about/uncertain, exact/certain, before this date, or after this date. If you have enough information to include a well-informed estimate for a year and the person is properly connected upstream or downstream then that well-informed estimate is acceptable. In the profile narrative, it is a good idea to state the date is estimated and to state how you arrived at the estimate (perhaps birth years of siblings, marriage dates, wills in which they may be mentioned, etc).