How to Filter Potential Leads by Graduation Year in Clay

I want to find the age of potential leads. My age range is ideally 40 to 60. I've read that a way to do this is to filter by the year that the prospect graduated. A 40 year old was born in 1984. Started uni in 2002 and graduated 3 years later. 2005. So the years my prospects graduated from are from between 1985 and 2005. Or they started uni from 1982 to 2002. How do I go about doing this in Clay?