Castell is from Orlando, Florida and attended West Orange High School. As a senior, he tallied two interceptions, two fumble recoveries, and three defensive touchdowns.[1] Coming out of high school, Castell was rated as a four-star recruit, the number 13 safety in the country, and as the 202nd best player in the class, where he held 34 scholarship offers.[2] Castell committed to play college football for the Florida Gators.[3]
College career
In week 3 of the 2023 season, Castell notched ten tackles and a pass deflection as he helped the Gators upset #10 Tennessee, earning Southeastern Conference (SEC) freshman of the week and the Shaun Alexander freshman of the week honors.[4][5] In week 10, Castell recorded his first career interception against Arkansas.[6]