Bell better hope things go well for the 29-year-old Bell in Baltimore. We know how quickly this league can dispose of players at the running back position. For most NFL running backs turning 30 means “the end,” and opportunities soon dry up around the league. If Bell can contribute and put forth a good showing with the Ravens, he may set himself up for another one- or two-year deal, prolonging his career. If not, Bell will continue fading into the background and will be gone by the age of 30, like so many other NFL backs before him.