https://www.profootballfocus.com/blog/2015/12/31/pro-top-10-nfl-secondaries-this-season-2/
5. St. Louis Rams
Average PFF grade: 76.8
Cornerbacks: Trumaine Johnson (87.0); Janoris Jenkins (81.3); Lamarcus Joyner (66.1)
Safeties: Rodney McLeod (85.0); T.J. McDonald (64.8)
All five Rams’ players listed are fourth-year players or younger, and keep progressively getting better. Johnson is now the fifth-ranked cornerback, ranking No.1 in NFL QB rating allowed in his coverage (47.4) to go along with seven interceptions. McLeod is currently the ninth-ranked safety, and has played the second-most snaps among all secondary players, with 1,096, behind only Philadelphia’s Malcolm Jenkins. McDonald had also improved prior to his season-ending shoulder injury.
Standout stat: The average age of these five is exactly 25 years old.