• In this Nov. 29, 2015 file photo, San Jose Marauders youth football players play sports mascots during halftime of an NFL football game between the San Francisco 49ers and the Arizona Cardinals in Santa Clara, Calif. The first concussion study of its kind found youth football players are more likely to return to play less than a day after injury than than those in high school and college. The novel research also found differences in concussion symptoms depending on players' age, offering guidance for parents, doctors and coaches in assessing injured players. (AP Photo/Marcio Jose Sanchez, File)

    Study: Football concussions and resuming play vary by age

    CHICAGO (AP) — Younger football players are more likely to return to the field less than a day after suffering concussions than those in high school and college, according to a new study.