How to calculate the amount of years between 2 dates?

I’m trying to calculate the amount of years a person has been the member of an association. This is required on a monthly basis (as it is being published in a monthly magazine). I have the entry date of a member and I would have to combine it somehow with the current date. But as you probably know, calculated columns cannot use the [Today] parameter. How could I possibly solve this?

Thanks a lot 🙂