Possible to use relative date in Rules?

Hello,

I would like to use the Rules module to automatically assign users specific roles, based on the user's current age. I have set-up a custom date field during the user registration process (field_birthdate). I also have created a rule that is executed every time the user logs in.

However, I'm having trouble using relative dates (i.e. field_birthdate + X years) in the data comparison condition. I receive an error message (The integrity check failed with the following error message: "condition data_is: Missing configuration for parameter data.").

Is there a way I can fix this error and/or a better way to go about solving my current problem?

Thanks in advance!